Commitments and Contingencies (Commitments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Office Leases
2016	$ 6,550
2017	5,046
2018	3,648
2019	3,685
2020	3,618
Thereafter	13,712
Total minimum payments	36,259
Rent expense	5,800	$ 6,800	$ 8,300
Sublease income	200	$ 200	$ 800
Accrued Loss on Excess Office Facilities
Office Leases
Total minimum payments	$ 2,600