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Long-Term Debt (Narrative) (Details)			3 Months Ended		9 Months Ended
	May 31, 2018 USD ($)	Nov. 30, 2016 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Covenant To Actual Ratios [Line Items]
Repayments of Long-term Lines of Credit					$ 37,300,000	$ 188,000,000
Revolving credit facility present accordion provisions			$ 75,000,000		75,000,000
Carrying value of the liability component			$ 319,577,000		319,577,000		$ 319,108,000
Deferred payments		$ 2,000,000
Amortization of Debt Issuance Costs					$ 289,000	420,000
Ratio Actual [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)			4.89		4.89
Ratio of earnings to fixed cost obligations (in Ratio)			2.20		2.20
Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity			$ 150,000,000		$ 150,000,000
Senior Notes [Member]
Debt Covenant To Actual Ratios [Line Items]
Repayments of Long-term Lines of Credit	$ 291,400,000
Amortization of Debt Issuance Costs			$ 35,000	$ 33,000	$ 103,000	44,000
Stated interest rate percentage			6.625%		6.625%
Interest Expense, Debt			$ 5,400,000	5,400,000	$ 16,100,000	7,200,000
Credit Agreement [Member]
Debt Covenant To Actual Ratios [Line Items]
Amortization of Debt Issuance Costs						172,000
Credit Agreement [Member] | Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.125%
Prime Rate Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.00%
Libor Margin Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.00%
Series of Individually Immaterial Business Acquisitions [Member]
Debt Covenant To Actual Ratios [Line Items]
Interest Expense, Debt			$ 152,000	191,000	$ 481,000	$ 616,000
Revolving Credit Facility, Secured, Floating Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Weighted average interest rate			3.90%		4.00%	4.00%
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Carrying value of the liability component			$ 18,000,000		$ 18,000,000
Revolving Credit Facility [Member] | Credit Agreement 2018 [Member]
Debt Covenant To Actual Ratios [Line Items]
Carrying value of the liability component							$ 27,100,000
Amortization of Debt Issuance Costs			$ 59,000	$ 41,000	$ 167,000

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