Interest Expense (Details Calc) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Expense, Debt [Abstract]
Total interest expense	$ 12,775	$ 13,848	$ 25,543	$ 51,870
Interest Costs Capitalized	154	35	254	63
Interest Expense	$ 12,621	$ 13,813	$ 25,289	$ 51,807