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Derivatives and Hedging (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | $ 1,071,000,000 | $ 1,071,000,000 | $ 131,000,000 | |||||||||
| Total | (11,484,000) | (11,484,000) | (470,000) | |||||||||
| Unrealized gains included in accumulated other comprehensive loss | 11,400,000 | 11,400,000 | 0 | |||||||||
| Amount of ineffective hedges | 0 | 0 | 0 | 0 | ||||||||
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Interest rate swap
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Fair value assets | 2,765,000 | 2,765,000 | ||||||||||
| Fair value liabilities | (14,200,000) | (14,200,000) | (500,000) | |||||||||
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Not Designated as Hedging Instrument | Swap-cash flow, hedge type one
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 40,000,000 | [1] | 40,000,000 | [1] | 40,000,000 | [1] | ||||||
| Hedge interest rate (as a percent) | 1.00% | [1] | 1.00% | [1] | ||||||||
| Fair value liabilities | (31,000) | [1] | (31,000) | [1] | (265,000) | [1] | ||||||
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Not Designated as Hedging Instrument | Swap-cash flow, hedge type two
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 31,000,000 | [1] | 31,000,000 | [1] | 31,000,000 | [1] | ||||||
| Hedge interest rate (as a percent) | 1.00% | [1] | 1.00% | [1] | ||||||||
| Fair value liabilities | (24,000) | [1] | (24,000) | [1] | (205,000) | [1] | ||||||
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Not Designated as Hedging Instrument | Interest rate cap, hedge type one
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 0 | [1] | 0 | [1] | 60,000,000 | [1] | ||||||
| Hedge interest rate (as a percent) | 1.00% | [1] | 1.00% | [1] | ||||||||
| Fair value liabilities | 0 | [1] | 0 | [1] | 0 | [1] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type one
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 275,000,000 | [2] | 275,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.1175% | [2] | 1.1175% | [2] | ||||||||
| Fair value assets | 2,765,000 | [2] | 2,765,000 | [2] | ||||||||
| Fair value liabilities | 0 | [2] | ||||||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type two
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 175,000,000 | [2] | 175,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.5625% | [2] | 1.5625% | [2] | ||||||||
| Fair value liabilities | (2,792,000) | [2] | (2,792,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type three
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 175,000,000 | [2] | 175,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.635% | [2] | 1.635% | [2] | ||||||||
| Fair value liabilities | (3,362,000) | [2] | (3,362,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | ISwap-cash flow, hedge type four
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 16,500,000 | [2] | 16,500,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.825% | [2] | 1.825% | [2] | ||||||||
| Fair value liabilities | (354,000) | [2] | (354,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type five
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 16,500,000 | [2] | 16,500,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.751% | [2] | 1.751% | [2] | ||||||||
| Fair value liabilities | (294,000) | [2] | (294,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type six
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 40,500,000 | [2] | 40,500,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.825% | [2] | 1.825% | [2] | ||||||||
| Fair value liabilities | (869,000) | [2] | (869,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type seven
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 41,500,000 | [2] | 41,500,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.751% | [2] | 1.751% | [2] | ||||||||
| Fair value liabilities | (740,000) | [2] | (740,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type eight
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 18,000,000 | [2] | 18,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.825% | [2] | 1.825% | [2] | ||||||||
| Fair value liabilities | (386,000) | [2] | (386,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type nine
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 17,000,000 | [2] | 17,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.751% | [2] | 1.751% | [2] | ||||||||
| Fair value liabilities | (303,000) | [2] | (303,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type ten
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 125,000,000 | [2] | 125,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 2.018% | [2] | 2.018% | [2] | ||||||||
| Fair value liabilities | (3,054,000) | [2] | (3,054,000) | [2] | 0 | [2] | ||||||
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Designated as Hedging Instrument | Swap-cash flow, hedge type eleven
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| Financial Instruments: Derivatives and Hedging | ||||||||||||
| Notional value | 100,000,000 | [2] | 100,000,000 | [2] | 0 | [2] | ||||||
| Hedge interest rate (as a percent) | 1.944% | [2] | 1.944% | [2] | ||||||||
| Fair value liabilities | $ (2,040,000) | [2] | $ (2,040,000) | [2] | $ 0 | [2] | ||||||
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