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Long-Term Debt (Details) (USD $) | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  | 0 Months Ended |
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Sep. 30, 2013 | Dec. 31, 2012 | May 16, 2013 Term A Loans, Term B Loans and Revolving Loans [Member] | Sep. 30, 2013 Notes Payable to Banks [Member] Term-B Loan Facility due May 2020 [Member] | May 16, 2013 Notes Payable to Banks [Member] Term-B Loan Facility due May 2020 [Member] | Sep. 30, 2013 Notes Payable to Banks [Member] Term-A Loan Facility due May 2017 [Member] | Dec. 31, 2012 Notes Payable to Banks [Member] Term-A Loan Facility due May 2017 [Member] | Sep. 30, 2013 Notes Payable to Banks [Member] Term-B Loan Facility due May 2019 [Member] | Dec. 31, 2012 Notes Payable to Banks [Member] Term-B Loan Facility due May 2019 [Member] | May 16, 2013 Notes Payable to Banks [Member] Senior Secured Credit Agreement [Member] | Sep. 30, 2013 Notes Payable to Banks [Member] Term-A Loan Facility due May 2018 [Member] | May 16, 2013 Notes Payable to Banks [Member] Term-A Loan Facility due May 2018 [Member] | Sep. 30, 2013 Revolving Credit Facility [Member] | Sep. 30, 2013 Revolving Credit Facility [Member] Revolving Credit Facility due May 2017 [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] Revolving Credit Facility due May 2017 [Member] | May 16, 2013 Revolving Credit Facility [Member] Revolving Credit Facility due May 2018 [Member] | May 16, 2013 Eurodollar [Member] Notes Payable to Banks [Member] Term-B Loan Facility due May 2020 [Member] | Sep. 30, 2013 Maximum [Member] | May 16, 2013 Maximum [Member] Revolving Credit Facility [Member] Revolving Credit Facility due May 2018 [Member] | May 16, 2013 Maximum [Member] Eurodollar [Member] Notes Payable to Banks [Member] Revolving Loans and Term A Loans [Member] | May 16, 2013 Minimum [Member] Revolving Credit Facility [Member] Revolving Credit Facility due May 2018 [Member] | May 16, 2013 Minimum [Member] Eurodollar [Member] Notes Payable to Banks [Member] Revolving Loans and Term A Loans [Member] | May 16, 2013 Minimum [Member] Eurodollar [Member] Notes Payable to Banks [Member] Term-B Loan Facility due May 2020 [Member]
Debt Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 10,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five | 314,438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 357,813,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase in Additional Principal Amount |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio in Latest Year of Debt Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  | 2.50% |  | 1.75% | 1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  | 0.25% |  |
Debt Instrument, Face Amount |  |  |  |  | 275,000,000 |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Debt | 357,813,000 | 426,588,000 |  | 262,813,000 |  | 0 | 92,500,000 | 0 | 334,088,000 |  | 95,000,000 |  |  | 0 | 0 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,500,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  | 3.50% |  |  |  |  |  |  | 2.20% |  |  |  |  |  |  |  |  |  |  |  |
Leverage Ratio | 2.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25 |  |  |  |  |
Debt, Weighted Average Interest Rate | 3.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged equity interest in foreign subsidiaries | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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