Long-Term Debt (Net Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Disclosure [Abstract]
Interest expense	$ 9,751	$ 7,160	$ 18,160	$ 15,522
Interest income	(457)	(655)	(1,107)	(1,372)
Capitalized interest	(4,059)	(1,988)	(7,748)	(5,150)
Net interest expense	$ 5,235	$ 4,517	$ 9,305	$ 9,000