Long-Term Debt Details (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Interest	$ 37,652	$ 37,542	$ 25,115
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	55,500
Long-term Debt, Maturities, Repayments of Principal in Year Two	155,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	371,300
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 500,000