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Long-Term Debt - Credit Agreement (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 489,025,000 |  | $ 489,025,000 |  |
Repayment of term loan |  |  |  |  | 62,872,000 | $ 193,508,000 |
Loss on extinguishment of long-term debt |  |  | (2,000) | $ 0 | (1,183,000) | $ (397,000) |
Collateral Pledged |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum percent of shares of foreign subsidiaries | 66.00% |  |  |  |  |  |
Term Loan Maturing June 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 100,000,000 |  | $ 34,629,000 |  | $ 34,629,000 |  | $ 97,500,000
Repayment of term loan |  | $ 61,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  | 6.49% |  | 6.49% |  |
Frequency of periodic payment | quarterly |  |  |  |  |  |
Loss on extinguishment of long-term debt |  | $ (900,000) |  |  |  |  |
Term Loan Maturing June 2020 | First Loan Year |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Periodic principal payment (as a percent) | 5.00% |  |  |  |  |  |
Term Loan Maturing June 2020 | Second Loan Year |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Periodic principal payment (as a percent) | 10.00% |  |  |  |  |  |
Term Loan Maturing June 2020 | Third Loan Year |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Periodic principal payment (as a percent) | 15.00% |  |  |  |  |  |
Term Loan Maturing June 2020 | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.25% |  |  |  |  |  |
Term Loan Maturing June 2020 | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.25% |  |  |  |  |  |
Term Loan and Revolving Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maturity date | Jun. 30, 2020 |  |  |  |  |  |
Revolving Credit Facility Maturing June 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity | $ 150,000,000 |  |  |  |  |  |
Additional commitments | $ 100,000,000 |  |  |  |  |  |
Available borrowing capacity |  |  | $ 146,700,000 |  | $ 146,700,000 |  |
Letters of credit issued |  |  | $ 3,300,000 |  | $ 3,300,000 |  |
Commitment fee percentage | 0.50% |  |  |  |  |  |
Revolving Credit Facility Maturing June 2020 | Base Rate | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |
Revolving Credit Facility Maturing June 2020 | Base Rate | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.25% |  |  |  |  |  |
Revolving Credit Facility Maturing June 2020 | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.75% |  |  |  |  |  |
Revolving Credit Facility Maturing June 2020 | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.25% |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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