Summary of Significant Accounting Policies - Acquisition Related Expenses and Other One-Time Transaction Related Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other non-routine transaction related expenses:
Audit Committee Investigation and related matters	$ 4,742	$ 15,316
Legal fees and expenses	83	475
Other fees and expenses	0	632
Total costs incurred	4,825	16,423
Insurance recoveries	(10,000)	0
Total	$ (5,175)	$ 16,423