Summary of Significant Accounting Policies - Litigation and Other Non-Routine Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Litigation and other non-routine costs:
Audit Committee Investigation and related matters	$ 5,221	$ 9,251	$ 13,413	$ 38,953
Legal fees and expenses	59	(294)	155	2,659
Other fees and expenses	0	0	0	632
Total costs incurred	5,280	8,957	13,568	42,244
Insurance recoveries	(650)	(925)	(11,196)	(925)
Total	$ 4,630	$ 8,032	$ 2,372	$ 41,319