Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Cash and Cash Equivalents	$ 259,266	$ 426,212
Restricted Cash	0	0
Total Financial Assets	280,150	501,433
Financial Liabilities:
Total debt	0	0
Total Financial Liabilities	0	0
Foreign currency forward purchase agreements, net		0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Cash and Cash Equivalents	0	0
Restricted Cash	22,044	21,095
Total Financial Assets	22,044	21,095
Financial Liabilities:
Total debt	828,990	727,440
Total Financial Liabilities	828,990	727,440
Foreign currency forward purchase agreements, net		(971)
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Cash and Cash Equivalents	0	0
Restricted Cash	0	0
Total Financial Assets	0	0
Financial Liabilities:
Total debt	0	0
Total Financial Liabilities	0	0
Foreign currency forward purchase agreements, net		0
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets:
Cash and Cash Equivalents	259,266	426,212
Restricted Cash	22,044	21,095
Total Financial Assets	302,194	522,528
Financial Liabilities:
Total debt	828,990	727,440
Total Financial Liabilities	828,990	727,440
Foreign currency forward purchase agreements, net		(971)
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Interest rate swap agreements	0	0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Interest rate swap agreements	5,078	(5,156)
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Interest rate swap agreements	0	0
Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Liabilities:
Interest rate swap agreements	(5,078)	5,156
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current		1,791
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current		0
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current		0
Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current		1,791
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current	20,884	73,430
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current	0	0
Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets:
Available-for-sale Securities, Debt and Equity Securities, Current	$ 20,884	$ 73,430