Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$ 307,579us-gaap_ProfitLoss	$ 265,156us-gaap_ProfitLoss	$ 152,421us-gaap_ProfitLoss
Other Comprehensive (Loss) Income:
Net unrealized gain on investments, net of taxes	354	340	0
Realized gain on investments	(38)	0	0
Realized gain on derivatives	0	5,893	0
Net unrealized gain (loss) on derivatives	131	530	(123)
Amortization of loss on derivatives and designated hedges	2,052	2,299	2,650
Retirement liability adjustment	(10,733)	11,479	473
Total	(8,234)	20,541	3,000
Comprehensive Income	299,345	285,697	155,421
Comprehensive Income Attributable to Noncontrolling Interests	(19,571)	(44,894)	(5,781)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 279,774us-gaap_ComprehensiveIncomeNetOfTax	$ 240,803us-gaap_ComprehensiveIncomeNetOfTax	$ 149,640us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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