Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies
Rental expense	$ 6,900,000	$ 6,900,000	$ 7,300,000
Minimum rental commitments
2014	6,671,000
2015	4,904,000
2016	3,310,000
2017	2,113,000
2018	1,301,000
Thereafter	10,000
Minimum rental commitments under all non-cancelable leases	18,309,000
Future minimum commitments
2014	15,225,000
2015	941,000
2016	492,000
2017	304,000
2018	41,000
Total commitments	17,003,000
Purchase Obligations
Future minimum commitments
2014	14,775,000
2015	491,000
2016	42,000
2017	41,000
2018	41,000
Total commitments	15,390,000
Debt Interest Obligations
Future minimum commitments
2014	450,000
2015	450,000
2016	450,000
2017	263,000
Total commitments	$ 1,613,000