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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense	$ 5,592	$ 5,743	$ 17,690	$ 17,044
Loss on extinguishment of debt	$ 0	$ 0	$ 11,883	326
Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense				(300)
Loss on extinguishment of debt				$ 300