Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]
Net income, basic									$ 20,121	$ 23,802	$ 22,974
Basic (in shares)									44,408	44,036	43,143
Basic (in dollars per share)	$ 0.17	$ 0.02	$ 0.16	$ 0.10	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.45	$ 0.54	$ 0.53
Effect of dilutive stock options and warrants (in shares)									454	475	266
Net income, diluted									$ 20,121	$ 23,802	$ 22,974
Diluted (in shares)									44,862	44,511	43,409
Diluted (in dollars per share)	$ 0.17	$ 0.02	$ 0.16	$ 0.10	$ 0.14	$ 0.11	$ 0.17	$ 0.12	$ 0.45	$ 0.53	$ 0.53
Antidilutive securities excluded from EPS (in shares)									727	423	1,292