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Debt and Credit Agreements - 2016 Senior Secured Credit Facility (Details) - USD ($) |  |  |  | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 | Dec. 02, 2016 | Jan. 05, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Apr. 11, 2017 | Jan. 06, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 6,300,000 | $ 5,300,000 | $ 0 |  |  |
Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  | 59,000,000 |  |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 102,500,000 |  |  | $ 137,000,000 |  |
Debt issuance cost, Amended Credit Agreement |  |  |  | 2,106,000 |  |  |  |  |
Total Debt, net of deferred issuance cost |  |  |  | 210,125,000 | 254,141,000 |  | 210,125,000 |  |
Carrying amount of debt |  |  |  | 217,000,000 | 260,500,000 |  | 217,000,000 |  |
Long-term debt, fair value |  |  |  | 220,900,000 |  |  | 220,900,000 |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 400,000,000 |  |  |  |  |  |
Annual capital expenditure limitation per Credit Agreement |  |  | 35,000,000 |  |  |  |  | $ 45,000,000 |
Maximum allowed non-permitted investments per Credit Agreement |  |  | $ 10,000,000 |  |  |  |  | $ 20,000,000 |
Debt issuance cost |  |  |  | $ 10,100,000 |  |  | 10,100,000 |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate |  |  | 1.50% |  |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate |  |  | 2.25% |  |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate |  |  | 0.50% |  |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate |  |  | 1.25% |  |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | Federal Funds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate |  |  | 0.50% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  |  | 5 years |  |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  | $ 59,000,000 |  |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 92,500,000 |  |  |  |  |
Carrying amount of debt |  |  |  | $ 34,500,000 | 68,000,000 |  | 34,500,000 |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 200,000,000 |  |  |  |  |  | $ 315,000,000
Debt instrument, term (in years) |  |  | 5 years |  |  |  |  |  |
Proceeds from debt | $ 59,000,000 |  | $ 55,000,000 |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage, unused capacity |  |  | 0.20% |  |  |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage, unused capacity |  |  | 0.35% |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  |  | 5 years |  |  |  |  |
Term Loan Facility | Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  | $ 0 |  |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 10,000,000 |  |  |  |  |
Carrying amount of debt |  |  |  | $ 182,500,000 | $ 192,500,000 |  | $ 182,500,000 |  |
Term Loan Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 200,000,000 |  |  |  |  |  |
Debt instrument, term (in years) |  |  | 5 years |  |  |  |  |  |
Periodic payment, principal percent years one and two |  |  | 5.00% |  |  |  |  |  |
Periodic payment, principal percent years three and four |  |  | 10.00% |  |  |  |  |  |
Periodic payment, principal percent year five |  |  | 15.00% |  |  |  |  |  |
Proceeds from debt |  | $ 40,000,000 | $ 200,000,000 |  |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 10,000,000 |  |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 1.50% |  |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 2.25% |  |  |  |  |  |
Bridge Loan [Member] | Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 10,000,000 |  |  |  |  |  |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: 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)) -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://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=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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