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Credit Agreement - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Jan. 05, 2016 | Nov. 05, 2014 | Nov. 04, 2014 | Sep. 30, 2013 | Sep. 25, 2013
Line of Credit | Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility with a letter of credit sub limit |  |  |  |  | $ 10,000,000 |
Increases in to aggregate commitments (does not exceed $25 million) |  |  |  |  | $ 25,000,000 |
Commitment fee percentage | 0.25% |  |  |  |  |
Line of Credit | Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility with a letter of credit sub limit |  |  |  |  |  | $ 75,000,000
Eurodollar | Line of Credit | Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 1.75% |  |  |  |  |
Federal Funds Effective Swap Rate | Line of Credit | Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 0.50% |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Line of Credit | Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 1.75% |  |  |  |  |
November 2014 Stock Repurchase Program |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Authorized amount of repurchase of common stock |  |  | $ 50,000,000 | $ 25,000,000 |  |
Subsequent Event | Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility with a letter of credit sub limit |  | $ 10,000,000 |  |  |  |
Subsequent Event | Line of Credit | Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility with a letter of credit sub limit |  | 200,000,000 |  |  |  |
Subsequent Event | Line of Credit | Secured Credit Facility | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility with a letter of credit sub limit |  | $ 400,000,000 |  |  |  |

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- Definition Line of Credit Facility, Additional Borrowing Capacity + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stock Repurchase Program, Authorized Annual Amount + References No definition available. + Details
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Balance Type: | credit
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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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -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 available but unused credit capacity under the credit facility. + References No definition available. + Details
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