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Equity Investments - Schedule of Equity Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 09, 2014	Jun. 30, 2014	Jul. 02, 2013	Mar. 15, 2013
Equity Investments
Equity investments	$ 0us-gaap_EquityMethodInvestments	$ 517,991us-gaap_EquityMethodInvestments
Equity in earnings of investees	24,460	25,754	11,420
SIR
Equity Investments
Ownership Percentage	0.00%	44.20%		0.00%	36.70%	56.00%
Equity investments	0	512,078
Equity in earnings of investees	24,516	21,153	0
GOV
Equity Investments
Ownership Percentage	0.00%	0.00%					18.20%
Equity investments	0	0
Equity in earnings of investees	0	4,111	10,836
AIC
Equity Investments
Ownership Percentage	0.00%	12.50%
Equity investments	0	5,913
Equity in earnings of investees	$ (56)	$ 490	$ 584

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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