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Line Of Credit (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 10, 2018 | Oct. 10, 2017 | Jun. 13, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility principal payment |  |  |  | $ 10,000 | $ 0 | $ 0 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  | $ 300,000 |  |  |  |
Credit facility stated percentage |  |  | 0.00% |  |  |  |
Credit facility accordion feature, increase limit |  |  | $ 100,000 |  |  |  |
Credit facility borrowings |  |  |  | 40,000 |  |  |
Credit facility amount outstanding |  |  |  | 30,000 |  |  |
Credit facility principal payment |  | $ 10,000 |  |  |  |  |
Credit facility commitment fees |  |  |  | $ 781 | $ 531 | $ 483 |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 1.00% |  |  |  |
Credit facility description of variable rate basis |  |  | London InterBank Offered Rate |  |  |  |
Revolving Credit Facility [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 0.50% |  |  |  |
Credit facility description of variable rate basis |  |  | Federal Funds Rate |  |  |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility commitment fee per annum on daily unused portion (as a percent) |  |  | 0.15% |  |  |  |
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 0.25% |  |  |  |
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 1.25% |  |  |  |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility commitment fee per annum on daily unused portion (as a percent) |  |  | 0.30% |  |  |  |
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 1.00% |  |  |  |
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility variable interest rate basis spread (as a percent) |  |  | 2.00% |  |  |  |
Weighted Average [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility interest rate during the period |  |  |  | 2.58% |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility principal payment | $ 10,000 |  |  |  |  |  |
Credit facility remaining borrowing capacity |  |  |  |  |  |  | $ 280,000

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- Definition Line of Credit Facility, Conditional Increase (Decrease), Net + 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 reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + 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 Amount of the fee for available but unused credit capacity under the credit 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 Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition The effective interest rate during the reporting period. + 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 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 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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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + 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 + Details
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