Long-term Debt and Capital Lease Obligations, Line of Credit Facility (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 90,000,000
Debt and Capital Lease Obligations	263,204,000	$ 240,053,000
Reserve Against line of Credit	15,000,000
Line of Credit Facility, Remaining Borrowing Capacity	75,000,000
Letters of Credit Outstanding, Amount	1,325,000
Line of Credit Facility, Current Borrowing Capacity	$ 50,175,000
Line of Credit Facility, Borrowing Capacity, Description	The maximum amount, less reserves, available for borrowing at levels below $30,000 is based on a sum of 45% of eligible receivables, 30% of eligible inventories and an additional amount of eligible equipment up to 20% of total borrowings under the facility. The maximum amount, less reserves, available for borrowing at levels above $30,000 is based on a sum of 75% of eligible receivables, 45% of eligible inventories and an additional amount of eligible equipment up to 20% of total borrowings under the facility.
Line of Credit Facility, Interest Rate During Period	4.80%
Line of Credit Facility, Average Outstanding Amount	$ 18,267,000
Commitment fee (in hundredths)	0.50%
Federal funds rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	0.50%
One Month Eurodollar [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	1.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.375%
Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	3.00%
Minimum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	2.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.50%
Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	3.50%
Maximum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	2.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt and Capital Lease Obligations	$ 23,500,000	$ 0