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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 03, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |  |
Collateralized debt facility | $ 7,000,000.0 | $ 7,000,000 | $ 6,959,000
Variable rate on loan |  | 3.39% |
Outstanding borrowings |  | $ 395,500,000 |
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 |  | 388,500,000 |
Remaining borrowing capacity on line of credit |  | $ 58,300,000 |
Fixed interest rate percent |  |  | 2.68%
Debt subject to fixed interest rate |  |  | $ 175,000,000.0
Credit Agreement | Variable Rate 1 |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable interest rate percent |  | 3.52% | 2.82%
Debt subject to variable interest rate |  | $ 213,500,000 | $ 97,000,000.0
Credit Agreement | Interest Rate Swap 2 |  |  |
Line of Credit Facility [Line Items] |  |  |
Fixed interest rate percent |  | 2.12% |
Debt subject to fixed interest rate |  | $ 175,000,000.0 |
Revolving Credit Facility | Credit Agreement |  |  |
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% |
Revolving Credit Facility | Credit Agreement | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage |  | 0.15% |
Revolving Credit Facility | Credit Agreement | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage |  | 0.40% |
Term Loan | Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, face amount |  |  | 150,000,000
Bridge Loan | Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  |  | $ 25,000,000

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