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Long-Term Debt (Long-term Debt Table) (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Accumulated Amortization, Debt Issuance Costs	$ 4,518,000		$ 4,442,000
Revolving credit facility, maximum borrowing capacity	300,000,000
Debt issuance costs	(891,000)		(967,000)
Current maturities on long-term debt	(16,996,000)		(16,927,000)
Long-term debt, excluding current maturities	200,275,000		212,154,000
Revolving credit facility present accordion provisions	75,000,000
Amortization of Debt Issuance Costs	208,000	$ 203,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs	100,000	$ 100,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Carrying value of the liability component			92,000,000
Credit Agreement [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Carrying value of the liability component	123,750,000		127,500,000
Current maturities on long-term debt	(15,000,000)		(15,000,000)
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]
Debt Instrument [Line Items]
Carrying value of the liability component	10,212,000		10,548,000
Current maturities on long-term debt	$ (1,996,000)		$ (1,927,000)
Term Number Two [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)	3.5

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Additional borrowing capacity under the credit facility's accordion feature providing the right to increase the line of credit borrowing capacity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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