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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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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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