Swaps Foreign Currency Swaps (Details) AUD in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 AUD
Derivative [Line Items]
Realized Gain (Loss) on Foreign Currency Derivative Instruments Not Designated As Hedging Instruments | $		$ 54,475	$ 0	$ 0
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $		$ 65,200
Foreign Exchange [Member]
Derivative [Line Items]
Derivative, Notional Amount | AUD					AUD 1,400,000
May 2015 cash receipt from sale of CCAL [Domain]
Derivative [Line Items]
Derivative, Notional Amount | AUD					AUD 1,400,000
Derivative, Inception Date		May 14, 2015
Derivative, Maturity Date		Jun. 12, 2015
Derivative, Currency Sold		US Dollar
Derivative, Currency Bought		Australian Dollar
Derivative, Forward Exchange Rate					0.8072
Installment payment from Buyer [Domain]
Derivative [Line Items]
Derivative, Notional Amount | AUD					AUD 155,000
Derivative, Inception Date		May 14, 2015
Derivative, Maturity Date		Jan. 04, 2016
Derivative, Currency Sold		US Dollar
Derivative, Currency Bought		Australian Dollar
Derivative, Forward Exchange Rate					0.7984
Unrealized Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $	[1]	$ 10,749

[1] As of December 31, 2015, the Company marked-to-market the swap with a notional value of Australian dollar $155 million and recorded (1) an asset within "other current assets" on the Company's consolidated balance sheet and (2) a corresponding gain on foreign currency swaps, which is included as a component of "other income (expense)" on the Company's consolidated statement of operations.