Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

Long-term Debt consisted of the following: 

	(in thousands)	Jun 30, 2015			Dec 31, 2014
4.650% Senior Notes due 2024:
	Principal of the Notes	$	500,000		$	500,000
	Issuance costs, net of amortization	(6,417		)	(6,761		)
	Fair value of interest rate swap on $100 million of principal	(666		)	(230		)
Term Loan Facility		300,000			250,000
Revolving Credit Facility		—			—
Long-term Debt		$	792,917		$	743,009