Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments [Abstract]
Total net rent expense	$ 12,200	$ 14,000	$ 18,300
Net Operating Leases
2015	5,148
2016	3,464
2017	2,614
2018	1,611
2019	990
Thereafter	419
Total minimum payments	14,246
Other Contractual Obligations
2015	555
2016	551
2017	550
2018	0
2019	0
Thereafter	0
Total minimum payments	$ 1,656