Summary of Significant Accounting Policies - Deferred Financing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in deferred financing costs
Balance at the beginning of the period	$ 2,337	$ 2,485	$ 2,216
Write-off of unamortized capitalized deferred financing costs			(701)
Deferred financing costs capitalized on new debt	2,320		1,549
Amortization of deferred financing costs	(624)	(148)	(579)
Balance at the end of the period	$ 4,033	$ 2,337	$ 2,485