Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details)

v2.4.1.9
Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Notional Amount $ 48,367,024two_DerivativeAverageNotionalAmount $ 34,518,856two_DerivativeAverageNotionalAmount  
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Expense on Interest Rate Swap and Swaption Agreements (91,754)two_InterestExpenseOnInterestRateSwapAndSwaptionAgreements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember 		(58,522)two_InterestExpenseOnInterestRateSwapAndSwaptionAgreements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember 		(38,448)two_InterestExpenseOnInterestRateSwapAndSwaptionAgreements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Derivative, Average Notional Amount $ 23,329,504two_DerivativeAverageNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember 		$ 16,965,918two_DerivativeAverageNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember 		$ 9,891,749two_DerivativeAverageNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember