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Debt - Senior Unsecured Credit Facility (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 28, 2019 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Increase in credit facility | $ 600,000,000 |  |  |
Percent of unused portion, line of credit facility, triggering lower commitment fee percentage | 50.00% |  |  |
Senior unsecured credit facility | $ 0 |  |  |
Unsecured term loan | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest and unused credit facility fees | 1,200,000 | $ 1,000,000 | $ 1,300,000 |
Senior unsecured credit facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 300,000,000 |  |  |
Senior unsecured credit facility | $ 0 | $ 0 |  |
Senior unsecured credit facility | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.50% |  |  |
Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee on unused percentage | 0.20% |  |  |
Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee on unused percentage | 0.30% |  |  |
Line Of Credit Facility Covenant Actual Results |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum leverage ratio | 0.275 |  |  |
Subsequent Event |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior unsecured credit facility |  |  |  | $ 45,000,000

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- Definition Line of credit facility interest and commitment fee amount. + References No definition available. + Details
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- Definition Line of credit facility maximum leverage ratio + References No definition available. + Details
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- Definition Percent Of Unused Portion Line Of Credit Facility Triggering Commitment Fee Percentage + 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 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 Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 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 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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