Equity Investments (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jul. 02, 2013
Income Statements:
Total revenues	$ 201,741	$ 226,802	$ 699,207	$ 662,587
Operating expenses	(94,632)	(92,005)	(287,650)	(265,227)
General and administrative	(25,069)	(12,565)	(61,445)	(34,190)
Operating income	30,326	68,813	179,845	203,545
Interest expense	(39,359)	(50,736)	(134,824)	(148,924)
Equity in earnings of investees	10,492	2,868	14,913	8,655
Income before income tax expense	1,686	21,124	67,131	64,009
Income tax expense	(785)	(1,322)	(2,527)	(1,906)
Net (loss) income	(216,207)	22,265	(151,666)	67,425
SIR
Income Statements:
Total revenues	48,584	30,878	138,390	86,385
Operating expenses	(9,287)	(5,710)	(26,172)	(16,828)
Depreciation and amortization	(8,485)	(3,888)	(22,445)	(9,682)
Acquisition related costs	(790)	(583)	(1,479)	(1,258)
General and administrative	(3,208)	(2,626)	(8,884)	(5,664)
Operating income	26,814	18,071	79,410	52,953
Interest expense	(3,232)	(2,467)	(10,484)	(4,436)
Equity in earnings of investees	64	115	219	189
Income before income tax expense	23,646	15,719	69,145	48,706
Income tax expense	(52)		(132)
Net (loss) income	23,594	15,719	69,013	48,706
Weighted average common shares outstanding	49,686	31,206	42,790	25,226
Net income per common share (in dollars per share)	$ 0.47	$ 0.50	$ 1.61	$ 1.93
Equity method investments, ownership percentage					56.00%
AIC
Income Statements:
Amount invested in equity investee	5,209		5,209
Combined carrying value of equity method investments	$ 5,781		$ 5,781
Number of other companies which are shareholders of related party	4		4
Equity method investments, ownership percentage	12.50%		12.50%