Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassifications [Line Items]
General and administrative	$ 8,021	$ 7,859	$ 24,720	$ 23,687
Acquisition and pursuit costs	507	865	1,878	3,411
Total		8,724		27,098
Depreciation		0		0
Depreciation and amortization	$ 35,873	31,985	$ 105,148	93,668
Total		31,985		93,668
As Previously Reported
Reclassifications [Line Items]
General and administrative		8,724		27,098
Acquisition and pursuit costs		0		0
Total		8,724		27,098
Depreciation		29,273		85,494
Amortization		2,712		8,174
Depreciation and amortization		0		0
Total		$ 31,985		$ 93,668