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Long-Term Debt (Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 | May 07, 2018 | Nov. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 19, 2014
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Long-term Lines of Credit |  |  |  |  |  | $ 188,000,000 | $ 67,300,000 |  |
Revolving credit facility present accordion provisions |  |  |  | $ 75,000,000 |  | 75,000,000 |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 900,000 |  | $ 900,000 |  |  |
Debt Covenant, Percentage Operations |  |  |  | 50.00% |  | 50.00% |  |  |
Carrying value of the liability component |  |  |  | $ 318,956,000 |  | $ 318,956,000 |  | $ 0 |
Deferred payments |  |  | $ 2,000,000 |  |  |  |  |  |
Accumulated Amortization, Debt Issuance Costs |  |  |  | 4,518,000 |  | 4,518,000 |  | 4,442,000 |
Amortization of Debt Issuance Costs |  |  |  |  |  | 420,000 | 614,000 |  |
Net loss on early extinguishment of debt |  |  |  | $ 0 | $ 0 | (936,000) | 0 |  |
Write off of Deferred Debt Issuance Cost | $ 700,000 |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  |  |  |  | $ 7,200,000 |  |  |
Term Number Two [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |  |  |  | 5.5 |  | 5.5 |  |  |
Ratio Minimum Per Covenant [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Ratio of earnings to fixed cost obligations (in Ratio) |  |  |  | 1.2 |  | 1.2 |  |  |
Ratio Actual [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |  |  |  | 4.86 |  | 4.86 |  |  |
Ratio of earnings to fixed cost obligations (in Ratio) |  |  |  | 1.95 |  | 1.95 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |
Write off of Deferred Debt Issuance Cost | 900,000 |  |  | 1,600,000 |  | 1,600,000 |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 150,000,000 |  | 150,000,000 |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 148,019,435 |  | 148,019,435 |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures |  | $ 1,200,000 |  |  |  |  |  |  |
Component of Convertible Debt, Transaction Expense, Early Extinguishment |  | 500,000 |  |  |  |  |  |  |
Carrying value of the liability component |  |  |  | 25,697,000 |  | 25,697,000 |  | 124,441,000 |
Accumulated Amortization, Debt Issuance Costs |  |  |  | 455,000 |  | 455,000 |  | $ 1,877,000 |
Amortization of Debt Issuance Costs |  |  |  | 27,000 | 130,000 | 200,000 | 400,000 |  |
Write off of Deferred Debt Issuance Cost |  | $ 1,300,000 |  | $ 700,000 |  | $ 700,000 |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 80.00% |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  | 2.75% |  | 2.75% |  |  | 2.75%
Interest Expense, Debt |  |  |  | $ 200,000 | 1,000,000 | $ 1,700,000 | 3,000,000 |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | 325,000,000 |  | 325,000,000 |  |  |
Repayments of Long-term Lines of Credit | $ 291,400,000 |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 1,400,000 |  | $ 1,400,000 |  |  |
Weighted average interest rate |  |  |  | 6.87% |  | 6.69% |  |  |
Accumulated Amortization, Debt Issuance Costs |  |  |  | $ 11,000 |  | $ 11,000 |  |  |
Amortization of Debt Issuance Costs |  |  |  | $ 33,000 |  | $ 44,000 |  |  |
Stated interest rate percentage |  |  |  | 6.625% |  | 6.625% |  |  |
Interest Expense, Debt |  |  |  | $ 5,400,000 |  | $ 7,200,000 |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  | 100,000 |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Amount drawn under term loan facility |  |  |  | 0 |  | $ 0 |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | QTD [Member] |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 4.00% |  |  |
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 |  |  |  | $ 200,000 | $ 300,000 | $ 600,000 | $ 700,000 |  |

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