Income Taxes (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets - current:
Derivative instruments current, net	$ 9,636,000	$ 0
Incentive compensation-other, net	7,641,000	6,468,000
Deferred Tax Assets Valuation Allowance Net Current	(16,778,000)	(6,468,000)
Net deferred tax assets - current	499,000	0
Deferred Tax Liabilities Current [Abstract]
Derivative instruments, net	(499,000)	0
Deferred tax assets - non - current [Abstract]
Property and equipment	158,216,000	350,978,000
Deferred gain on sale	52,045,000	55,329,000
U.S. federal tax credit carryforwards	16,254,000	4,870,000
Net operating loss carryforwards	108,048,000	17,755,000
Incentive compensation/other, net	13,007,000	15,104,000
Deferred tax assets noncurrent before valuation allowances	347,570,000	444,036,000
Valuation allowance	(346,596,000)	(443,300,000)
Net deferred tax assets - non-current	974,000	736,000
Deferred Tax Liabilities - non current [Abstract]
Other	968,000	736,000
Net non-current tax liabilities	968,000	736,000
Net non-current tax asset	$ 6,000	$ 0