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Long-term Debt - Credit Agreement (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 USD ($) Rate | Sep. 30, 2017 USD ($) | Sep. 30, 2017 | Sep. 19, 2017 USD ($) Rate | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio |  | 3.00 |  |  |  | 3.00 |  |
Payments of Financing Costs |  |  | $ 1,100 |  |  |  |  |
Debt financing and related expenses |  |  |  |  |  | $ (6,640) | $ 0 | $ (1,970)
Write off of Deferred Debt Issuance Cost |  |  | $ 2,000 |  |  |  |  | 1,500
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate | [1],[2] | 1.50% |  |  | 1.625% |  |  |
Incremental debt commitments capacity |  | $ 200,000 |  |  |  | 200,000 |  |
Revolving credit and term loan facilities [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payments of Financing Costs |  |  |  |  |  |  |  | 1,800
Debt Issuance Costs, Noncurrent, Net |  |  |  |  |  |  |  | 1,400
Debt financing and related expenses |  |  |  |  |  |  |  | $ 400
Bank debt and receivables facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 332,100 |  |  |  | 332,100 | 126,500 |
Senior Secured Term Loan A [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate | [1],[2] |  |  |  | 1.625% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 275,000 |  |  |
Debt Instrument, Maturity Date |  |  |  |  | Jun. 30, 2020 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.625% |  |  |  |
Debt Instrument, Maturity Date |  | Sep. 20, 2022 |  |  | Jun. 30, 2020 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 300,000 |  |  | $ 500,000 | 300,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases |  | 125,000 |  |  | $ 75,000 | 125,000 |  |
Revolving Credit Facility, Amount Outstanding |  | 10,800 |  |  |  | 10,800 | 75,900 |
Revolving Credit Facility, Remaining Borrowing Capacity |  | 274,300 |  |  |  | 274,300 | 408,200 |
Letters of credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 40,000 |  |  |  | 40,000 |  |
Letters of Credit Outstanding, Amount |  | $ 14,900 |  |  |  | $ 14,900 | $ 15,900 |
[1] | London Interbank Offered Rate ("LIBOR")
[2] | The initial interest rate spread for the amended Credit Agreement is stated as 1.625%. The interest rate spread is based upon the leverage ratio, as defined, as of the most recent determination date.

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- Definition Incremental debt commitments capacity. + References No definition available. + Details
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- Definition Net leverage ratio, as defined + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + 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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