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Debt and Credit Agreements - Schedule of Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |
Repayment of debt and revolving credit facility |  |  | $ (60,000) | $ (12,500)
Amortization of deferred issuance cost | $ 600 | $ 600 | 1,145 | $ 1,145
Wells Fargo Bank, National Association |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |
Debt under credit facilities at beginning of period |  |  | 140,000 |
Deferred issuance cost, net at beginning of period |  |  | (4,583) |
Total Debt, net of deferred issuance cost at beginning of period |  |  | 135,417 |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |
Proceeds from lines of credit |  |  | 0 |
Deferred issuance cost, gross |  |  | 0 |
Increase in borrowings net of deferred issuance cost |  |  | 0 |
Repayment of debt and revolving credit facility |  |  | (60,000) |
Amortization of deferred issuance cost |  |  | 1,145 |
Decrease in repayment/amortization net of deferred issuance cost |  |  | (58,855) |
Components of ending debt balance [Abstract] |  |  |  |
Debt under credit facilities at end of period | 80,000 |  | 80,000 |
Deferred issuance cost, net at end of period | (3,438) |  | (3,438) |
Total Debt, net of deferred issuance cost at end of period | 76,562 |  | 135,417 |
Wells Fargo Bank, National Association | Term loan facility |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |
Debt under credit facilities at beginning of period |  |  | 140,000 |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |
Proceeds from lines of credit |  |  | 0 |
Repayment of debt and revolving credit facility |  |  | (60,000) |
Components of ending debt balance [Abstract] |  |  |  |
Debt under credit facilities at end of period | 80,000 |  | 80,000 |
Wells Fargo Bank, National Association | Revolving credit facility |  |  |  |
Components of beginning debt balance [Abstract] |  |  |  |
Debt under credit facilities at beginning of period |  |  | 0 |
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |  |  |
Proceeds from lines of credit |  |  | 0 |
Repayment of debt and revolving credit facility |  |  | 0 |
Components of ending debt balance [Abstract] |  |  |  |
Debt under credit facilities at end of period | $ 0 |  | $ 0 |

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- Definition Proceeds from Long-term Lines of Credit, Finance Costs + References No definition available. + Details
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- Definition Proceeds from Long-term Lines of Credit, Net of Financing Costs + References No definition available. + Details
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- Definition Repayments of Lines of Credit, Net of Financing Costs + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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- Definition The cash inflow 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://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=118932676&loc=d3e3255-108585 + Details
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