Long-Term Debt and Financing Arrangements - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Long Term Debt And Other Financing Arrangement [Line Items]
Maximum percentage of stock of certain first-tier foreign subsidiaries pledged to secure senior credit facility	66.00%	66.00%
Interest coverage ratio (minimum) effective from March 31, 2014 through March 22, 2017	2.75
Leverage Ratio Required (Maximum) for future quarters	3.50
Revolving Credit Facility [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Maximum borrowing capacity	$ 1,200,000	$ 1,200,000
Tranche Term Facility [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Maximum borrowing capacity	293,000	293,000
Debt Issuance Cost	2,000
Principal payments excluded from current liabilities	15,000	15,000
Tranche Term Facility [Member] | Corporate Debt Securities [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Maximum borrowing capacity	291,000	$ 291,000
Tranche Term Facility [Member] | June 30, 2014 through March 31, 2015 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan	3,750
Tranche Term Facility [Member] | June 30, 2015 through March 31, 2016 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan	5,625
Tranche Term Facility [Member] | June 30, 2016 through December 31, 2016 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan	7,500
Tranche Term Facility [Member] | Due on March 22, 2017 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan	$ 195,000
5 3/8 percent senior notes due December 15, 2024 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Stated percentage	5.375%	5.375%
6 7/8 percent senior notes due Dec 15, 2020 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Stated percentage	6.875%	6.875%
Adjustments for New Accounting Principle, Early Adoption [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Unamortized Debt Issuance Expense	$ 13,000	$ 13,000	$ 14,000
Revolving Credit Facility [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Unused Borrowing Capacity	1,099,000	1,099,000
Borrowings outstanding	67,000	67,000
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Maximum borrowing capacity	1,200,000	1,200,000
Revolving Credit Facility [Member] | Tranche Term Facility [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Debt Issuance Cost		2,000
Net carrying amount of debt	291,000	291,000
Long-term Debt, Gross	293,000	293,000
Revolving Credit Facility [Member] | Letter of Credit (Member)
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility letters of credit outstanding	34,000
Revolving Credit Facility [Member] | 5 3/8 percent senior notes due December 15, 2024 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Debt Issuance Cost		4,000
Net carrying amount of debt	221,000	221,000
Unsecured debt	225,000	225,000
Revolving Credit Facility [Member] | 6 7/8 percent senior notes due Dec 15, 2020 [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Debt Issuance Cost		7,000
Net carrying amount of debt	493,000	493,000
Unsecured debt	500,000	500,000
Revolving Credit Facility [Member] | Other Debt [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
Unsecured debt	$ 158,000	$ 158,000