Summary of Significant Accounting Policies - Litigation and Other Non-Routine Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Litigation and other non-routine costs:
Audit Committee Investigation and related matters	$ 3,450	$ 14,386	$ 8,192	$ 29,702
Legal fees and expenses	13	2,478	96	2,953
Other fees and expenses	0	0	0	632
Total costs incurred	3,463	16,864	8,288	33,287
Insurance recoveries	(546)	0	(10,546)	0
Total	$ 2,917	$ 16,864	$ (2,258)	$ 33,287