Other Obligations (Details) (Capital Lease Obligations [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Capital Lease Obligations [Member]
Capital Equipment Lease Obligations
Base rate on interest on leases	LIBOR
Margin over base rate on lease agreement (as a percent)	1.95%
Interest rate (as a percent)	2.13%
Gross value of property, plant, and equipment under capital leases	$ 11,400,000
Accumulated depreciation of property, plant, and equipment under capital leases	2,200,000
Future payments on capital equipment lease obligation payments
2015	1,354,000
2016	1,774,000
2017	1,740,000
2018	1,705,000
2019	1,670,000
Thereafter	879,000
Total	9,122,000
Less: interest	493,000
Total principal payments	8,629,000
Less: current portion	1,633,000
Capital equipment lease obligations, net of current portion	$ 6,996,000