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Debt and Credit Agreements - Components of Debt (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Debt Borrowing, Repayment, Amortization during period [Abstract] |  |
Repayment of debt and revolving credit facility | $ (39,000) | $ (2,500)
Amortization of deferred issuance cost | 573 | $ 573
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 | (39,000) |
Amortization of deferred issuance cost | 573 |
Decrease in repayment/amortization net of deferred issuance cost | (38,427) |
Components of ending debt balance [Abstract] |  |
Debt under credit facilities at end of period | 101,000 |
Deferred issuance cost, net at end of period | (4,010) |
Total Debt, net of deferred issuance cost at end of period | 96,990 |
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 | (39,000) |
Components of ending debt balance [Abstract] |  |
Debt under credit facilities at end of period | 101,000 |
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 |

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- Definition Components of beginning debt balance [Abstract] + References No definition available. + Details
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- Definition Components of ending debt balance [Abstract] + References No definition available. + Details
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- Definition Debt Borrowing, Repayment, Amortization during period [Abstract] + References No definition available. + Details
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- Definition Long-term Line of Credit, Gross + References No definition available. + Details
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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=109223946&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=115205541&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 accumulated amortization, of debt issuance costs. 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -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 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=6879938&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=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 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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