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Significant Accounting Policies (Estimated Future Annual Amortization Expense of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2015 $ 100,286us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 85,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 64,220us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 53,854us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 34,305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 53,052us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 390,717us-gaap_FiniteLivedIntangibleAssetsNet