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Cumulative Other Comprehensive Loss - Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassifications out of cumulative other comprehensive income (loss)      
Interest rate swap contracts $ 143,230us-gaap_InterestExpense $ 173,011us-gaap_InterestExpense $ 202,055us-gaap_InterestExpense
Realized gains and losses on available for sale securities (24,460)us-gaap_IncomeLossFromEquityMethodInvestments (25,754)us-gaap_IncomeLossFromEquityMethodInvestments (11,420)us-gaap_IncomeLossFromEquityMethodInvestments
Total reclassifications (4,956)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax    
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income (Loss)      
Reclassifications out of cumulative other comprehensive income (loss)      
Total reclassifications 4,956us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
   
Equity in Unrealized Gain (Loss) of an Investee      
Reclassifications out of cumulative other comprehensive income (loss)      
Total reclassifications 64us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
   
Equity in Unrealized Gain (Loss) of an Investee | Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income (Loss)      
Reclassifications out of cumulative other comprehensive income (loss)      
Realized gains and losses on available for sale securities (64)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
   
Interest rate swap contracts | Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income (Loss)      
Reclassifications out of cumulative other comprehensive income (loss)      
Interest rate swap contracts $ 5,020us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember