Debt And Credit Arrangements Scheduled Annual Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 250,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	6,160
Long Term Debt Maturities Total Repayments Due	256,160
Interest Paid	$ 5,113	$ 6,838	$ 7,233