Earnings Per Common Share (Reconciliation of Earnings (loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Income (loss) per common share - Basic	$ (0.43)	$ (0.19)
Income (loss) per common share - Diluted	$ (0.43)	$ (0.19)
Numerator (basic and diluted)
Net income (loss)	$ (27,699)	$ (12,019)
Denominator
Weighted-average shares, outstanding	64,576	63,991
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	0
Weighted-average shares, Diluted	64,576	63,991
Stock Compensation Plan [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,909	5,105