Stock-Based Compensation Plans (Details2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
The 2007 plan | Restricted stock
Number Outstanding
Balance at the beginning of the period (in shares)	525,356	515,130	682,654
Shares cancelled		(5,750)	(60,110)
Shares vested	(78,302)	(221,732)	(258,822)
Balance at the end of the period (in shares)	452,054	525,356	515,130
Remaining average vesting period for recognition of unrecognized compensation expense	1 year 10 months 24 days
Unrecognized compensation expense (in dollars)	$ 5.1
Intrinsic value of unvested awards (in dollars)	8.4
The 2007 plan | Restricted stock | Awards vesting over four years
Number Outstanding
Vesting period	4 years	4 years	4 years
The 2007 plan | Restricted stock | Awards Vesting Over Three Years [Member]
Number Outstanding
Shares granted		174,500
Vesting period		3 years
The 2007 plan | Restricted Stock Four Year Vesting [Member]
Number Outstanding
Shares granted	5,000	13,000	130,000
The 2007 plan | Restricted Stock One Year Vesting [Member]
Number Outstanding
Shares granted		50,208	21,408
1996 Plan
Number Outstanding
Stock options outstanding (in shares)	49,000
Intrinsic value of outstanding stock options (in dollars)	$ 0.5