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Borrowings (Details) $ in Thousands		3 Months Ended
	Oct. 10, 2014 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Capitalized leases		$ 8,645	$ 8,716
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement initiation date		Oct. 10, 2014
Credit Agreement aggregate principal amount	$ 150,000
Credit Agreement term	5 years
Credit Agreement optional increase in aggregate principal amount		$ 75,000
Debt maturity date		Oct. 10, 2019
Credit Agreement maximum consolidated total leverage ratio		3.00
Credit Agreement minimum interest coverage ratio		3.5
Credit Agreement availability		$ 150,000
Credit Agreement outstanding balance		$ 0	$ 0
Revolving Credit Facility [Member] | LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		1.00%
Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement quarterly commitment fee percentage		0.20%
Minimum [Member] | Revolving Credit Facility [Member] | Leverage Ratio [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		0.25%
Minimum [Member] | Revolving Credit Facility [Member] | LIBOR Rate Plus Levarage Ratio [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		1.25%
Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement quarterly commitment fee percentage		0.25%
Credit Agreement maximum cash dividends in a fiscal year		$ 30,000
Maximum [Member] | Revolving Credit Facility [Member] | Federal Funds Open Rate [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		0.50%
Maximum [Member] | Revolving Credit Facility [Member] | Leverage Ratio [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		0.50%
Maximum [Member] | Revolving Credit Facility [Member] | LIBOR Rate Plus Levarage Ratio [Member]
Line of Credit Facility [Line Items]
Credit Agreement applicable margin		1.50%

X

- Definition

Potential Principal Increase Under Credit Facility.

+ References

No definition available.

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- Definition

Ratio of Consolidated EBITDA to cash interest expense.

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- Definition

Ratio of Total Funded Indebtedness to Consolidated EBITDA.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Name Accounting Standards Codification
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 942
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-Number 210
-Section 02
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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

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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.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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