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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($) |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 03, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 13, 2017 | Jul. 06, 2016
Line of Credit Facility [Line Items] |  |  |  |  |
Outstanding borrowings |  | $ 209,250,000 |  |  |
Collateralized debt facility | $ 7,000,000.0 | $ 7,000,000 | $ 6,959,000 |  |
Variable rate on loan |  | 3.12% |  |  |
LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Outstanding borrowings |  | $ 202,300,000 |  |  |
Remaining borrowing capacity on line of credit |  | 248,400,000 |  |  |
Fixed interest rate percent |  |  | 2.68% |  |
Debt subject to fixed interest rate |  | $ 175,000,000.0 | $ 175,000,000 |  |
Credit Agreement | Variable Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Variable interest rate percent |  | 3.99% | 2.82% |  |
Debt subject to variable interest rate |  | $ 27,300,000 | $ 97,000,000 |  |
Credit Agreement | Interest Rate Swap |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Fixed interest rate percent |  | 2.87% |  |  |
Credit Agreement | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Increase to revolving credit commitment |  |  |  | $ 100,000,000 |
Maximum borrowing capacity |  |  |  | $ 375,000,000 |
Interest rate increase if in event of default |  | 2.00% |  |  |
Credit Agreement | Revolving Credit Facility | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee percentage |  | 0.15% |  |  |
Credit Agreement | Revolving Credit Facility | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee percentage |  | 0.40% |  |  |
Credit Agreement | Term Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 150,000,000
Credit Agreement | Bridge Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 25,000,000

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