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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards $ 23,500,000us-gaap_OperatingLossCarryforwards               $ 23,500,000us-gaap_OperatingLossCarryforwards    
Current Federal Tax Expense (Benefit)                 44,350,000us-gaap_CurrentFederalTaxExpenseBenefit 44,112,000us-gaap_CurrentFederalTaxExpenseBenefit 42,934,000us-gaap_CurrentFederalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit)                 23,546,000us-gaap_CurrentForeignTaxExpenseBenefit 25,103,000us-gaap_CurrentForeignTaxExpenseBenefit 20,965,000us-gaap_CurrentForeignTaxExpenseBenefit
Current State and Local Tax Expense (Benefit)                 4,727,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4,903,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4,344,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Income Tax Expense (Benefit)                 72,623,000us-gaap_CurrentIncomeTaxExpenseBenefit 74,118,000us-gaap_CurrentIncomeTaxExpenseBenefit 68,243,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit)                 2,801,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 4,754,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 963,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit)                 1,675,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 1,884,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 2,677,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred State and Local Income Tax Expense (Benefit)                 206,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 152,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (35,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit)                 4,682,000us-gaap_DeferredIncomeTaxExpenseBenefit 6,790,000us-gaap_DeferredIncomeTaxExpenseBenefit 3,605,000us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) $ 20,841,000us-gaap_IncomeTaxExpenseBenefit $ 19,909,000us-gaap_IncomeTaxExpenseBenefit $ 17,244,000us-gaap_IncomeTaxExpenseBenefit $ 19,311,000us-gaap_IncomeTaxExpenseBenefit $ 20,718,000us-gaap_IncomeTaxExpenseBenefit $ 20,490,000us-gaap_IncomeTaxExpenseBenefit $ 19,664,000us-gaap_IncomeTaxExpenseBenefit $ 20,036,000us-gaap_IncomeTaxExpenseBenefit $ 77,305,000us-gaap_IncomeTaxExpenseBenefit $ 80,908,000us-gaap_IncomeTaxExpenseBenefit $ 71,848,000us-gaap_IncomeTaxExpenseBenefit