Earnings Per Share (Details) - USD ($) $ / shares in Units, $ 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	$ 14,341	$ 11,130	$ 25,147	$ 19,529
Basic weighted average shares (in shares)	53,036,009	54,208,362	53,028,224	54,205,657
Effect of dilutive stock options and restricted stock (in shares)	365,229	461,401	367,137	508,947
Diluted weighted average shares (in shares)	53,401,238	54,669,763	53,395,361	54,714,604
Basic (usd per share)	$ 0.27	$ 0.21	$ 0.47	$ 0.36
Diluted (usd per share)	$ 0.27	$ 0.20	$ 0.47	$ 0.36
Anti-dilutive shares (in shares)	504,955	145,136	493,264	134,625