Capital Transactions (Details 3)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
$8 to $11
Stock options, exercise price
Exercise price range, low end of range (in dollars per share)	$ 8
Exercise price range, high end of range (in dollars per share)	$ 11
Options Outstanding
Number of options outstanding (in shares) | shares	19,458
Options outstanding, Weighted Average Remaining Contractual Life	5 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.10
$12 to $14
Stock options, exercise price
Exercise price range, low end of range (in dollars per share)	12
Exercise price range, high end of range (in dollars per share)	$ 14
Options Outstanding
Number of options outstanding (in shares) | shares	859,595
Options outstanding, Weighted Average Remaining Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.31
Options Exercisable
Number of options Exercisable (in shares) | shares	305,331
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 13.90
$15 to $18
Stock options, exercise price
Exercise price range, low end of range (in dollars per share)	15
Exercise price range, high end of range (in dollars per share)	$ 18
Options Outstanding
Number of options outstanding (in shares) | shares	185,376
Options outstanding, Weighted Average Remaining Contractual Life	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.43
Options Exercisable
Number of options Exercisable (in shares) | shares	179,416
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.64
$8 to $18
Stock options, exercise price
Exercise price range, low end of range (in dollars per share)	8
Exercise price range, high end of range (in dollars per share)	$ 18
Options Outstanding
Number of options outstanding (in shares) | shares	1,064,429
Options outstanding, Weighted Average Remaining Contractual Life	3 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.64
Options Exercisable
Number of options Exercisable (in shares) | shares	484,747
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 14.46