Stock Compensation Plans, Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Stock options, number of shares [Roll Forward]
Exercised (in shares)	20,640
Stock options, weighted average exercise price [Roll Forward]
Exercised (in dollars per share) | $ / shares	$ 4.06
Stock Options [Member]
Stock options, number of shares [Roll Forward]
Balance, beginning of period (in shares)	326,022
Granted (in shares)	42,689
Exercised (in shares)	(20,640)
Cancelled (in shares)	(15,188)
Expired (in shares)	(105,499)
Balance, end of period (in shares)	227,384
Stock options, weighted average exercise price [Roll Forward]
Balance, beginning of period (in dollars per share) | $ / shares	$ 11.08
Granted (in dollars per share) | $ / shares	7.30
Exercised (in dollars per share) | $ / shares	4.06
Cancelled (in dollars per share) | $ / shares	16.73
Expired (in dollars per share) | $ / shares	10.90
Balance, end of period (in dollars per share) | $ / shares	$ 10.72
2006 Stock Incentive Plan [Member] | Stock Options [Member]
Stock options, weighted average exercise price [Roll Forward]
Number of mature shares tendered by employees in stock-for-stock exercises (in shares)	0
2006 Stock Incentive Plan [Member] | Stock Options [Member] | Minimum [Member]
Stock options, weighted average exercise price [Roll Forward]
Holding period for matured shares	6 months