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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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