Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 12,527	$ 15,113	$ 43,272	$ 56,041
Basic EPS, Shares	83,286	87,387	83,301	87,663
Basic EPS, Per Share Amount	$ 0.15	$ 0.17	$ 0.52	$ 0.64
Effect of restricted stock	$ 0	$ 0	$ 0	$ 0
Effect of restricted stock, Shares	56	105	72	143
Diluted EPS, Net Income	$ 12,527	$ 15,113	$ 43,272	$ 56,041
Diluted EPS, Shares	83,342	87,492	83,373	87,806
Diluted EPS, Per Share Amount	$ 0.15	$ 0.17	$ 0.52	$ 0.64