Long-Term Debt (Wells Fargo Agreement) (Details)	12 Months Ended
	Dec. 31, 2014 USD ($)
Long-Term Debt
Deferred financing costs written off	$ 1,634,000
Credit Agreement | Wells Fargo Bank, N.A.
Long-Term Debt
Deferred financing costs written off	1,634,000
Working capital revolving credit facility | Wells Fargo Bank, N.A.
Long-Term Debt
Maximum borrowing capacity	20,000,000
Acquisition revolving credit facility | Wells Fargo Bank, N.A.
Long-Term Debt
Maximum borrowing capacity	$ 180,000,000