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Debt and Credit Agreement - 2016 Debt facilities narrative (Details) - Wells Fargo Bank, National Association - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 02, 2016 | Jan. 05, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2013 | Sep. 25, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  |  | $ 256,500,000 |  |  |
Proceeds from debt |  |  | 295,000,000 |  |  |
Debt issuance cost, net |  |  | 6,359,000 | $ 0 |  |
Debt issuance cost, gross |  |  | 7,949,000 |  |  |
Secured Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 400,000,000 |  |  |  |
Secured Credit Facility | 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 | 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 | 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 | 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 | 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] |  |  |  |  |  |
Proceeds from debt |  |  | 95,000,000 |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 200,000,000 |  |  |  | $ 75,000,000
Debt instrument, term |  | 5 years |  |  |  |
Proceeds from debt |  | $ 55,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 0.20% |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 0.35% |  |  |  |
Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from debt |  |  | $ 200,000,000 |  |  |
Term Loan Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 200,000,000 |  |  |  |
Debt instrument, term |  | 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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 10,000,000 |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  |  |  |  | $ 10,000,000 |
Letter of Credit | Line of Credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 1.50% |  |  |  |
Letter of Credit | Line of Credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 2.25% |  |  |  |
Bridge Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 10,000,000 |  |  |  |

X
- Definition Line of Credit Facility, Periodic Payment, Principal, Percent, Year Five + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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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- 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://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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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