Stock-Based Compensation (Details 2) (2012 Amended Executive Officer Non-Qualified Stock Option Agreement, USD $)	12 Months Ended
	Dec. 31, 2014
$16.52 to $18.05
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 16.52
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 18.05
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	473,334
WEIGHTED-AVERAGE REMAINING LIFE	1 year 2 months 12 days
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 16.53
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	470,001
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 16.52
$18.22 to $22.78
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 18.22
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 22.78
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	553,997
WEIGHTED-AVERAGE REMAINING LIFE	4 years 1 month 6 days
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 18.26
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	351,000
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 18.28
$23.27 to $72.13
Stock options outstanding and exercisable
Exercise Price Range, Lower Range Limit (in dollars per share)	$ 23.27
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 72.13
OPTIONS OUTSTANDING
NUMBER OUTSTANDING (in shares)	358,166
WEIGHTED-AVERAGE REMAINING LIFE	8 months 12 days
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 40.05
OPTIONS EXERCISABLE
NUMBER EXERCISABLE (in shares)	351,499
WEIGHTED-AVERAGE EXERCISE PRICE (in dollars per share)	$ 40.23