Debt Schedule of Long-Term Debt Repayments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 73,750		$ 115,002		$ 848,054
2011 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	18,750		15,002		7,500
2007 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	0		0		406,950
Secured Debt [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	73,750		115,002		624,450
Line of Credit [Member] | 2011 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	55,000	[1]	100,000	[1]	40,000
Line of Credit [Member] | 2007 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 0	[2]	$ 0	[2]	$ 170,000	[2]

[1] We borrowed $35.0 million and $80.0 million under the multicurrency revolving line of credit during 2013 and 2012, respectively.

[2] See repayment of the convertible senior subordinated notes below.