Debt Schedule of Long-Term Debt Repayments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 102,438,000		$ 73,750,000		$ 115,002,000
2011 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit	47,700,000		35,000,000		80,000,000
Repayments of Long-term Debt	26,250,000		18,750,000		15,002,000
Secured Debt [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	102,438,000		73,750,000		115,002,000
Line of Credit [Member] | 2011 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 76,188,000	[1]	$ 55,000,000	[1]	$ 100,000,000	[1]

[1] We borrowed $47.7 million, $35.0 million and $80.0 million under the multicurrency revolving line of credit during 2014, 2013 and 2012, respectively.