CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data |
Sep. 30, 2011 |
Dec. 31, 2010 |
|---|---|---|
| Trade accounts receivable, allowance for doubtful accounts | $ 10,244 | $ 10,040 |
| Property, plant and equipment, accumulated depreciation | 123,214 | 117,212 |
| Amortizable intangible assets, accumulated amortization | $ 22,414 | $ 20,496 |
| Treasury stock, shares | 2,317,650 | 2,317,650 |
Class A Common Stock |
||
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, authorized | 80,000,000 | 80,000,000 |
| Common stock, issued | 21,043,205 | 21,000,193 |
| Common stock, outstanding | 18,725,555 | 18,682,543 |
Class B Common stock |
||
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, authorized | 20,000,000 | 20,000,000 |
| Common stock, issued | 5,553,696 | 5,553,696 |
| Common stock, outstanding | 5,553,696 | 5,553,696 |
| X | ||||||||||
- Definition The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|