Debt (Senior Notes) (Narrative) (Details) (USD $)	1 Months Ended
	Sep. 30, 2012	Jul. 31, 2014	Jan. 31, 2014
Debt Instrument [Line Items]
Debt and Capital Lease Obligations		$ 402,531,000	$ 397,602,000
Senior Notes
Debt Instrument [Line Items]
Debt, face value	350,000,000	350,000,000	350,000,000
Debt, stated interest rate in percentage	3.75%	3.75%	3.75%
Proceeds from issuance of long-term debt	345,800,000
Debt discount	1,300,000	842,000	974,000
Debt issuance costs	$ 2,900,000
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate	100.00%
Treasury Rate | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate	50.00%