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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Total Short-Term Debt | $ 37,055 |  | $ 13,524 | $ 0 | $ 1,667
Long-Term Debt | 55,000 |  |  |  |
Less Unamortized Debt Issuance Costs | (561) |  | (15,258) | (1,195) | 0
Total Long-Term Debt | 54,439 |  | 110,392 | 151,104 | 80,391
Debt issuance costs | 900 |  | 17,200 | 1,500 | 200
Term Loan |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Long-Term Debt | 0 |  | 0 | 0 | 2,361
Term Loan | TPG Term Loan |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Long-Term Debt | 0 |  | 70,650 | 0 | 0
Debt issuance costs | 400 | $ 400 | 400 |  |
Wells Fargo Revolving Credit Facility |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Long-Term Debt | 0 |  | 0 | 97,299 | 78,030
Unsecured Senior Notes |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Long-Term Debt | 55,000 |  | 55,000 | 55,000 | 0
Term Loan | Wells Fargo Credit Agreement |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Total Short-Term Debt | 0 |  | 0 | 0 | 1,667
Term Loan | TPG Term Loan |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Total Short-Term Debt | 0 |  | 750 | 0 | 0
Wells Fargo Revolving Credit Facility |  |  |  |  |
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items] |  |  |  |  |
Total Short-Term Debt | $ 37,055 |  | $ 12,774 | $ 0 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(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 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 4: 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 + 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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