Future Minimum Lease Payments under Operating and Capital Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Operating Leases
2015	$ 4,888
2016	4,065
2017	3,149
2018	2,821
2019	1,791
Thereafter	5,605
Total minimum lease payments	22,319
Capital Leases
2015	1,261	[1]
2016	1,261	[1]
2017	1,290	[1]
2018	860	[1]
2019	884	[1]
Thereafter	9,045	[1]
Total minimum lease payments	$ 14,601	[1]

[1] Capital lease payments include interest payments of $4.3 million.