Derivative Instruments and Hedging Activities - Narrative (Details) $ in Thousands, NOK in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 NOK	Jun. 30, 2015 USD ($)	Sep. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Feb. 28, 2013 NOK	Jan. 31, 2013 USD ($)	Jan. 31, 2013 NOK
Derivative [Line Items]
Unrealized losses related to foreign currency contracts	$ 18,000
Unrealized loss on hedges, net	27,891	$ 32,091
Loss in Accumulated OCI to be reclassified within twelve months	9,600
Grand Canyon [Member]
Derivative [Line Items]
Notional amount								$ 104,600	NOK 591.3
Grand Canyon II [Member]
Derivative [Line Items]
Notional amount			NOK 434.1			$ 100,400	NOK 594.7
Grand Canyon III [Member]
Derivative [Line Items]
Notional amount			NOK 185.2			$ 98,800	NOK 595.0
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount					$ 148,100
Interest Rate Swaps [Member] | Nordea Q5000 Loan 2020 [Member]
Derivative [Line Items]
Notional amount				$ 187,500
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Unrealized loss on hedges, net	19,800
Other income (expense), net [Member] | Grand Canyon [Member]
Derivative [Line Items]
Unrealized loss on hedge ineffectiveness	1,500
Other income (expense), net [Member] | Grand Canyon II [Member]
Derivative [Line Items]
Realized loss on hedge ineffectiveness		500
Unrealized loss on hedge ineffectiveness		$ 1,200
Other income (expense), net [Member] | Grand Canyon II and Grand Canyon III [Member]
Derivative [Line Items]
Realized loss on hedge ineffectiveness	$ 3,600