Commitments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commitments
Rental expense	$ 100,000	$ 100,000	$ 200,000	$ 100,000
Future minimum payments for operating leases
Remainder of 2014	203,000		203,000
2015	65,000		65,000
2016	10,000		10,000
Total	278,000		278,000
Future minimum payments for other commitments
Remainder of 2014	4,481,000		4,481,000
2015	3,513,000		3,513,000
2016	2,016,000		2,016,000
2017	311,000		311,000
2018 and thereafter	6,000		6,000
Total	10,327,000		10,327,000
Future minimum payments for operating leases and other commitments
Remainder of 2014	4,684,000		4,684,000
2015	3,578,000		3,578,000
2016	2,026,000		2,026,000
2017	311,000		311,000
2018 and thereafter	6,000		6,000
Total	$ 10,605,000		$ 10,605,000