Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassifications [Line Items]
General and administrative	$ 8,005	$ 7,756	$ 16,699	$ 15,828
Acquisition and pursuit costs	785	373	1,371	2,547
Total		8,129		18,375
Depreciation		0		0
Depreciation and amortization	$ 34,823	31,290	$ 69,274	61,684
Total		31,290		61,684
As Previously Reported
Reclassifications [Line Items]
General and administrative		8,129		18,375
Acquisition and pursuit costs		0		0
Total		8,129		18,375
Depreciation		28,528		56,221
Amortization		2,762		5,463
Depreciation and amortization		0		0
Total		$ 31,290		$ 61,684