Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Instrument [Line Items]

Schedule of Debt [Table Text Block]

Long-term Debt consisted of the following: 

	(in thousands)	Jun 30, 2016			Dec 31, 2015
4.650% Senior Notes due 2024:
	Principal of the Notes	$	500,000		$	500,000
	Issuance costs, net of amortization	(5,730		)	(6,073		)
	Fair value of interest rate swap on $100 million of principal	8,068			1,909
Term Loan Facility		300,000			300,000
Revolving Credit Facility		—			—
Long-term Debt		$	802,338		$	795,836