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