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Debt - Senior Secured Term Loan and Revolving Credit Facility (Details) - USD ($) | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Current portion of long-term debt | $ 0 | $ 39,800,000 | $ 0 |
Line of credit facility repayments | $ 72,000,000 | $ 0 | $ 72,000,000 | $ 0
Secured line of credit | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective interest rate |  | 4.53% |  |
Senior secured term loan | 3.98% Senior Secured Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  | $ 40,000,000 |  |
Senior secured term loan | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective interest rate |  | 4.10% |  |
Revolving credit facility | Secured line of credit | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | $ 250,000,000 |  |
Unused capacity, commitment fee percentage |  | 0.40% |  |
Consolidated total leverage ratio (less than) |  | 2.25 |  |
Revolving credit facility | Secured line of credit | Term loan facility | Leverage Ratio, less than 2.25 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused capacity, commitment fee percentage |  | 0.25% |  |
Revolving credit facility | Secured line of credit | Term loan facility | Base rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.75% |  |
Revolving credit facility | Secured line of credit | Term loan facility | Base rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.50% |  |
Revolving credit facility | Secured line of credit | Term loan facility | LIBOR | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.75% |  |
Revolving credit facility | Secured line of credit | Term loan facility | LIBOR | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 2.50% |  |
Revolving credit facility | Senior secured term loan | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount outstanding |  | $ 0 |  |
Letter of credit | Secured line of credit | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | 75,000,000 |  |
Letter of credit | Senior secured term loan | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount outstanding |  | 3,000,000 |  |
Swingline sub-facility | Secured line of credit | Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity |  | $ 25,000,000 |  |
Option 1 | Senior secured term loan | Term loan facility | Base rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate floor |  | 0.75% |  |
Option 1 | Senior secured term loan | Term loan facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 2.75% |  |
Option 2 | Senior secured term loan | Term loan facility | Base rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.75% |  |
Option 2 | Senior secured term loan | Term loan facility | U.S. federal funds effective rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.50% |  |
Option 2 | Senior secured term loan | Term loan facility | One month LIBOR Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.00% |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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