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Long-Term Debt - Credit Agreement (Details)	1 Months Ended				12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Feb. 29, 2016 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2016 USD ($) foreign_subsidiary	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs					$ 7,733,000	$ 5,664,000	$ 4,870,000
Number of foreign subsidiaries designated as not subject to Credit Agreement covenants | foreign_subsidiary					5
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Notional amount								$ 148,100,000
Term Loan Maturing June 2018 [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 300,000,000
Scheduled principal installments					$ 25,600,000
Balloon payment	$ 160,200,000				$ 160,200,000
Prepayment of debt	25,000,000	$ 8,000,000
Maturity date				Jun. 19, 2018
Term Loan Maturing June 2018 [Member] | Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Notional amount								$ 148,100,000
Fixed LIBOR rate on interest rate swaps (as a percent)								0.75%
Term Loan Maturing June 2018 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					4.50%
Term Loan Maturing June 2018 [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%
Term Loan Maturing June 2018 [Member] | Minimum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					2.00%
Term Loan Maturing June 2018 [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					3.00%
Term Loan Maturing June 2018 [Member] | Maximum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					4.00%
Revolving Credit Facility Maturing June 2018 [Member]
Debt Instrument [Line Items]
Borrowing capacity			$ 400,000,000	$ 600,000,000
Increase in aggregate commitments (up to)				$ 200,000,000
Available borrowing capacity	18,900,000				$ 18,900,000
Letters of credit issued	$ 4,100,000				$ 4,100,000
Commitment fee percentage					0.50%
Amortization of debt issuance costs			$ 2,500,000

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The maximum additional commitments that may be requested under the credit facility.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

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

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Amount of the required periodic payments applied to principal.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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