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Debt and Credit Agreement - Rollforward of 2016 new debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Amortization of debt financing fees | $ 1,590 | $ 0 | $ 0
Long term debt, current portion, net of deferred issuance cost | 8,410 | 0 |
Long term debt, net of deferred issuance cost | 245,731 | 0 |
Wells Fargo Bank, National Association |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit, Gross | 260,500 | 0 |
Proceeds from debt | 295,000 |  |
Repayment of debt and revolving credit facility | (34,500) |  |
Debt issuance cost, net | (6,359) | 0 |
Debt issuance cost, gross | (7,949) |  |
Amortization of debt financing fees | 1,590 |  |
Long-term Debt | 254,141 | 0 |
Proceeds from Long-term Lines of Credit, Net of Financing Costs | 287,051 |  |
Repayments of Lines of Credit, Net of Financing Costs | 32,910 |  |
Long term debt, current portion, net of deferred issuance cost | 8,410 |  |
Long term debt, net of deferred issuance cost | 245,731 |  |
Term Loan Facility | Wells Fargo Bank, National Association |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit, Gross | 192,500 | 0 |
Proceeds from debt | 200,000 |  |
Repayment of debt and revolving credit facility | (7,500) |  |
Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit, Gross | 68,000 | $ 0 |
Proceeds from debt | 95,000 |  |
Repayment of debt and revolving credit facility | $ (27,000) |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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