Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of income tax expense computed by applying federal corporate tax rate
Tax at statutory rate on earnings from continuing operations before unconsolidated entities, noncontrolling interest and income taxes	$ 104,392,000	$ 115,953,000	$ 78,381,000
State income taxes, net of federal benefit	(842,000)	(2,364,000)	700,000
Increase in valuation allowance	33,072,000	9,408,000	5,705,000
(Decrease) increase in ASC 740 income tax liability	656,000	(4,084,000)	2,420,000
Tax at statutory rate on earnings not subject to federal income taxes	(143,400,000)	(151,264,000)	(82,208,000)
Other differences	(160,000)	1,691,000	203,000
Income tax expense (benefit)	(6,282,000)	(30,660,000)	5,201,000
Sunrise Acquisition
Income tax
Net deferred tax liability related to temporary differences between financial reporting and tax bases of assets and liabilities acquired	(306,300,000)
ASLG
Income tax
Net deferred tax liability related to temporary differences between financial reporting and tax bases of assets and liabilities acquired	$ (44,600,000)