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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 23, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 06, 2016
Line of Credit Facility [Line Items] |  |  |  |
2017 Debt facility | $ 7,000,000 | $ 6,959,000 | $ 0 |
Variable rate on loan |  | 2.38% |  |
Outstanding borrowings |  | $ 278,959,000 |  |
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 |  | 272,000,000 |  |
Remaining borrowing capacity on line of credit |  | 188,000,000 |  |
Fixed interest rate percent |  |  | 2.98% |
Debt subject to fixed interest rate |  | $ 175,000,000 | $ 130,000,000 |
Credit Agreement | Variable Rate 1 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Variable interest rate percent |  | 2.82% | 3.12% |
Debt subject to variable interest rate |  | $ 97,000,000 | $ 45,000,000 |
Credit Agreement | Variable Rate 2 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Variable interest rate percent |  |  | 2.77% |
Debt subject to variable interest rate |  |  | $ 150,000,000 |
Credit Agreement | Interest Rate Swap 2 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Fixed interest rate percent |  | 2.68% |  |
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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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