Stock-Based Compensation (Details 1) - Non Qualified Stock Option $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at December 31, 2016, Number of options (shares) | shares	67,550
Granted, Number of options (shares) | shares	0
Exercised, Number of options (shares) | shares	(57,350)
Forfeited, Number of options (shares) | shares	(100)
Expired, Number of options (shares) | shares	(400)
Outstanding at June 30, 2017, Number of options (shares) | shares	9,700
Exercisable at June 30, 2017, Number of options (shares) | shares	9,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at December 31, 2016, Weighted average exercise price (usd per share) | $ / shares	$ 15.34
Granted, Weighted average exercise price (usd per share) | $ / shares	0.00
Exercised, Weighted average exercise price (usd per share) | $ / shares	15.11
Forfeited, Weighted average exercise price (usd per share) | $ / shares	19.38
Expired, Weighted average exercise price (usd per share) | $ / shares	19.38
Outstanding at June 30, 2017, Weighted average exercise price (usd per share) | $ / shares	16.53
Exercisable at June 30, 2017, Weighted average exercise price (usd per share) | $ / shares	$ 16.34
Outstanding at June 30, 2017, Weighted average remaining contractual term	10 months 18 days
Exercisable at June 30, 2017, Weighted average remaining contractual term	10 months 5 days
Outstanding at June 30, 2017, Aggregate intrinsic value | $	$ 96
Exercisable at June 30, 2017, Aggregate intrinsic value | $	$ 92