Accounting Policies and Basis of Presentation - Debt (Details)	Mar. 21, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Loan fees in other assets		$ 972,000	$ 1,013,000
Outstanding borrowings under credit facility		33,878,000
Credit facility, remaining borrowing capacity		$ 53,352,000
Average interest rate (as a percent)		3.24%
Revolver borrowings [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under credit facility		$ 12,875,000
Fixed asset sub-line term loan [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under credit facility		6,003,000
Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 80,000,000
Covenant compliance, maximum individual acquisition allowable (less than)	1,000,000
Covenant compliance, maximum aggregate acquisitions allowable	7,500,000
Unamortized loan fees		68,000
Loan fees in other assets		667,000
Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	95,000,000
Periodic payment, principal	250,000
Covenant compliance, maximum aggregate acquisitions allowable	$ 35,000,000
Covenant compliance, fixed charge coverage ratio excess availability (as a percent) (less than)	17.50%
Minimum [Member] | Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Covenant compliance, fixed charge coverage ratio	1.10
Minimum [Member] | Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Covenant compliance, fixed charge coverage ratio	1.25
Term Loan [Member] | Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Long-term debt	$ 15,000,000	$ 15,000,000