Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Net income, basic									$ 23,802	$ 22,974	$ 16,570
Basic (in shares)									44,036	43,143	42,607
Basic (in dollars per share)	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.20	$ 0.18	$ 0.09	$ 0.07	$ 0.54	$ 0.53	$ 0.39
Effect of dilutive stock options and warrants (in shares)									475	266	277
Net income, diluted									$ 23,802	$ 22,974	$ 16,570
Diluted (in shares)									44,511	43,409	42,884
Diluted (in dollars per share)	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.20	$ 0.18	$ 0.09	$ 0.07	$ 0.53	$ 0.53	$ 0.39
Antidilutive securities excluded from EPS (in shares)									423	1,292	1,823