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Debt Revolving Credit Agreement (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2018 | Mar. 31, 2017 | Dec. 31, 2018
Line of Credit Facility [Line Items] |  |  |
Revolving credit agreement |  |  | $ 0
Line of Credit Facility, Maturity, Conditional Restrictions, Value of Unrestricted Cash on Hand Threshold | $ 100,000,000 |  |
Proceeds from lines of credit |  | $ 75,000,000 |
Term of credit agreement |  | 6 months |
Available balance on line of credit agreement |  |  | 195,600,000
Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit agreement |  |  | 4,400,000
Foreign Currency Line of Credit | Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving line of credit sub-facility | 50,000,000 |  |
Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving credit agreement | 200,000,000 |  |
Revolving line of credit sub-facility | 500,000,000.0 |  |
Aggregate debt issuance costs |  |  | $ 1,500,000
Line of Credit | Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Revolving line of credit sub-facility | 10,000,000 |  |
Option to increase revolving line of credit, increase amount | $ 300,000,000.0 |  |
Maximum | Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Margin rate on revolving credit line | 1.00% |  |
Unused capacity fee |  |  | 0.30%
Minimum | Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Margin rate on revolving credit line | 0.375% |  |
Unused capacity fee | 0.20% |  |
London Interbank Offered Rate (LIBOR) | Maximum | Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Margin rate on LIBOR-based rate | 2.00% |  |
London Interbank Offered Rate (LIBOR) | Minimum | Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Margin rate on LIBOR-based rate | 1.375% |  |

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Option to Increase, Amount + References No definition available. + Details
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- Definition Line of Credit Facility, Maturity, Conditional Restrictions, Value of Unrestricted Cash on Hand Threshold + 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + 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://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 2: 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 Reference 3: 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 + 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(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 of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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