Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments [Abstract]
Total net rent expense	$ 14,000,000	$ 18,300,000	$ 13,600,000
Net Operating Leases
2015	6,431,000
2016	2,661,000
2017	1,772,000
2018	1,622,000
2019	948,000
Thereafter	624,000
Total minimum payments	14,058,000
Other Contractual Obligations
2015	1,008,000
2016	550,000
2017	550,000
2018	550,000
2019	0
Thereafter	0
Total minimum payments	$ 2,658,000