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Long-Term Debt (Details) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended																0 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Maximum [Member]	May 16, 2013 Term A Loans, Term B Loans and Revolving Loans [Member]	Dec. 31, 2013 Term Loan Facility $100 million term A loan facility, due May 2017	Dec. 31, 2012 Term Loan Facility $100 million term A loan facility, due May 2017	Dec. 31, 2012 Term Loan Facility $365 million term B loan facility, due May 2019	May 16, 2013 Term Loan Facility Revolving Loans and Term A Loans Maximum [Member]	May 16, 2013 Term Loan Facility Revolving Loans and Term A Loans Minimum [Member]	May 16, 2013 Term Loan Facility Term A Loans, Term B Loans and Revolving Loans [Member]	Dec. 31, 2013 Term Loan Facility Term-A Loan Facility due May 2018 [Member]	May 16, 2013 Term Loan Facility Term-A Loan Facility due May 2018 [Member]	Dec. 31, 2013 Term Loan Facility Term-B Loan Facility due May 2020 [Member]	Sep. 30, 2013 Term Loan Facility Term-B Loan Facility due May 2020 [Member]	May 16, 2013 Term Loan Facility Term-B Loan Facility due May 2020 [Member]	Dec. 31, 2013 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member]	May 16, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member]	May 16, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member] Maximum [Member]	May 16, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member] Minimum [Member]	Dec. 31, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member] Base Rate [Member]	Dec. 31, 2013 Revolving Credit Facility Revolving Credit Facility due May 2018 [Member] Spread [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 10,000,000	$ 10,000,000
Document Period End Date		Dec. 31, 2013
Senior Secured Debt	399,813,000	399,813,000	426,588,000					92,500,000	334,088,000				92,500,000		262,813,000				44,500,000
Face amount of term loan														100,000,000			275,000,000
Line of credit facility, maximum borrowing capacity						500,000,000														125,000,000
Increase to borrowing capacity available under credit facility												100,000,000
Write off of Deferred Debt Issuance Cost		14,958,000	813,000	0
Basis spread on variable rate borrowings										2.50%	1.75%						2.50%
Debt Instrument, Interest Rate, Stated Percentage																	1.00%
Revolving credit facility, unused portion, commitment fee percentage																					0.40%	0.25%
Pledged equity interest in foreign subsidiaries	65.00%	65.00%
Leverage Ratio in Latest Year of Debt Term					3.25
Interest rate at year end							2.20%									3.50%							0.17%	2.00%
Weighted average interest rate	3.00%	3.00%
Leverage ratio	2.20				4.00
Letters of credit outstanding, amount																		77,800,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	10,000,000	10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	10,000,000	10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	10,875,000	10,875,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	99,750,000	99,750,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	259,188,000	259,188,000
Long-term Debt	$ 399,813,000	$ 399,813,000

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