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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 11, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 13, 2017 | Jul. 06, 2016
Line of Credit Facility [Line Items] |  |  |  |  |
Outstanding borrowings |  | $ 384,500,000 |  |  |
Collateralized debt facility | $ 7,000,000.0 | $ 7,000,000 | $ 7,000,000 |  |
Variable rate on loan |  | 3.43% |  |  |
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 |  | $ 377,500,000 |  |  |
Remaining borrowing capacity on line of credit |  | $ 65,500,000 |  |  |
Fixed interest rate percent |  |  | 2.12% |  |
Debt subject to fixed interest rate |  |  | $ 175,000,000 |  |
Credit Agreement | Variable Rate 1 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Variable interest rate percent |  | 4.00% | 3.52% |  |
Debt subject to variable interest rate |  | $ 202,500,000 | $ 213,500,000 |  |
Credit Agreement | Interest Rate Swap 2 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Fixed interest rate percent |  | 2.62% |  |  |
Debt subject to fixed interest rate |  | $ 175,000,000 |  |  |
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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