Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies
Operating leases term, low end of range	1 year
Operating leases term, high end of range	5 years
Total lease and rent expense	$ 2,000,000	$ 2,000,000	$ 1,300,000
Future minimum payments under operating leases
2014	1,659,000
2015	1,370,000
2016	957,000
2017	333,000
Thereafter	$ 0