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Long-Term Debt Long-Term Debt (Narrative) (Details) $ in Thousands		3 Months Ended			12 Months Ended
	Feb. 09, 2016 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 19, 2014
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity					$ 300,000
Principal amount					$ 230,048
Ratio of indebtedness to net capital (in ratio)					3.15
Debt compliance, required minimum fixed charge ratio					1.20
Ratio of earnings to fixed cost obligations (in ratio)					2.14
Amortization of debt issuance costs					$ 820	$ 824	$ 921
After June 29, 2013
Debt Instrument [Line Items]
Debt compliance, required maximum leverage ratio					3.50
Line of Credit
Debt Instrument [Line Items]
Debt Instrument, Change in Basis Spread on Variable Rate	3750.00%
Number of Days Prior to the Maturity of Subordinated Debt the Credit Agreement Matures	91 days
Line of Credit | Prime Rate Option
Debt Instrument [Line Items]
Debt instrument interest rate (in percent)					1.55%
Line of Credit | LIBOR Margin Option
Debt Instrument [Line Items]
Debt instrument interest rate (in percent)					2.125%
Convertible subordinated notes
Debt Instrument [Line Items]
Principal amount	$ 143,750				$ 143,750	143,750
Debt instrument interest rate (in percent)								2.75%
Debt instrument, term					7 years
Write off of Deferred Debt Issuance Cost	600
Amortization of debt issuance costs					$ 500
Deferred Purchase Price Notes
Debt Instrument [Line Items]
Debt instrument interest rate (in percent)					0.00%
Deferred Purchase Price Notes | Minimum
Debt Instrument [Line Items]
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)					7.30%
Debt instrument, term					5 years
Deferred Purchase Price Notes | Maximum
Debt Instrument [Line Items]
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)					10.00%
Debt instrument, term					20 years
Credit Agreement [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs					$ 300	$ 400
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	150,000				150,000
Line of credit facility, potential increase to borrowing capacity	75,000				75,000
Credit Facility, Term Note
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 150,000				$ 150,000
Line of credit facility, weighted average interest rate					3.20%
Repayments of Lines of Credit				$ 2,810
Loans Payable [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					$ 2,000
Debt instrument interest rate (in percent)					2.125%
Scenario, Forecast [Member] | Credit Facility, Term Note
Debt Instrument [Line Items]
Repayments of Lines of Credit		$ 4,690	$ 3,750

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