Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator (for basic and diluted earnings per share)
Income (loss) from continuing operations		$ 11,488	$ (12,955)	$ 16,376	$ (21,070)
Less income allocated to RSUs		159	0	203	0
Numerator for basic and diluted earnings per share from continuing operations		$ 11,329	$ (12,955)	$ 16,173	$ (21,070)
Denominator
Basic weighted-average shares outstanding		83,773	83,903	83,869	70,692
Effect of dilutive securities:
Stock options held by employees and directors		278	0	315	0
Diluted weighted-average shares outstanding		84,051	83,903	84,184	70,692
Anti-dilutive securities	[1]	0	2,230	0	2,230

[1] (1) Amount outstanding at balance sheet date, before application of the treasury stock method and not weighted for period outstanding