Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 16,368	$ 23,316	$ 30,745	$ 40,928
Basic EPS, Shares	83,248	87,814	83,308	87,802
Basic EPS, Per Share Amount	$ 0.20	$ 0.27	$ 0.37	$ 0.47
Effect of restricted stock	$ 0	$ 0	$ 0	$ 0
Effect of restricted stock, Shares	71	153	82	164
Diluted EPS, Net Income	$ 16,368	$ 23,316	$ 30,745	$ 40,928
Diluted EPS, Shares	83,319	87,967	83,390	87,966
Diluted EPS, Per Share Amount	$ 0.20	$ 0.27	$ 0.37	$ 0.47