Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 15,113	$ 22,737	$ 56,041	$ 63,289
Basic EPS, Shares	87,387	87,778	87,663	87,737
Basic EPS, Per Share Amount	$ 0.17	$ 0.26	$ 0.64	$ 0.72
Effect of restricted stock	$ 0	$ 0	$ 0	$ 0
Effect of restricted stock, Shares	105	145	143	184
Diluted EPS, Net Income	$ 15,113	$ 22,737	$ 56,041	$ 63,289
Diluted EPS, Shares	87,492	87,923	87,806	87,921
Diluted EPS, Per Share Amount	$ 0.17	$ 0.26	$ 0.64	$ 0.72