Borrowing Arrangements (Details 2) (Cash flow hedge, Interest rate swaps, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 25, 2012
Cash flow hedge | Interest rate swaps
Interest rate swaps
Aggregate starting notional amount			$ 150,000
Fixed rate (as a percent)	0.7525%
Variable rate basis	LIBOR
Ineffective portion of cash flow hedges recognized	$ 0	$ 0