Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

v2.4.1.9
CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Trade accounts receivable, allowances $ 11,919us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12,727us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Inventories, reserves 1,408us-gaap_InventoryValuationReserves 1,227us-gaap_InventoryValuationReserves
Notes receivable, allowance 499us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent 539us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent
Property and equipment, accumulated depreciation 157,364us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 155,495us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Amortizable intangible assets, accumulated amortization $ 35,459us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 34,130us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Treasury stock, shares 2,317,650us-gaap_TreasuryStockShares 2,317,650us-gaap_TreasuryStockShares
Class A Common Stock [Member]    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock, authorized 80,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
80,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock, issued 22,155,255us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
22,082,140us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock, outstanding 19,837,605us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
19,764,490us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock [Member]    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common stock, authorized 20,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
20,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common stock, issued 5,553,696us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
5,553,696us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common stock, outstanding 5,553,696us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
5,553,696us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember