Stock-Based Compensation (Details 2) (Stock options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Options Outstanding
Number Outstanding (in shares)	495
Weighted Average Remaining Contractual Life	7 years 10 months 2 days
Weighted Average Exercise Price (in dollars per share)	$ 47.34
Options Exercisable
Number Exercisable (in shares)	128
Weighted Average Exercise Price (in dollars per share)	$ 40.04
$26.34-$37.41
Information about options outstanding
Low end of exercise price range (in dollars per share)	$ 26.34
High end of exercise price range (in dollars per share)	$ 37.41
Options Outstanding
Number Outstanding (in shares)	191
Weighted Average Remaining Contractual Life	6 years 9 months 22 days
Weighted Average Exercise Price (in dollars per share)	$ 34.40
Options Exercisable
Number Exercisable (in shares)	85
Weighted Average Exercise Price (in dollars per share)	$ 33.08
$40.17-$47.21
Information about options outstanding
Low end of exercise price range (in dollars per share)	$ 40.17
High end of exercise price range (in dollars per share)	$ 47.21
Options Outstanding
Number Outstanding (in shares)	14
Weighted Average Remaining Contractual Life	2 years 5 months 27 days
Weighted Average Exercise Price (in dollars per share)	$ 43.38
Options Exercisable
Number Exercisable (in shares)	4
Weighted Average Exercise Price (in dollars per share)	$ 42.13
$54.76-$54.76
Information about options outstanding
Low end of exercise price range (in dollars per share)	$ 54.76
High end of exercise price range (in dollars per share)	$ 54.76
Options Outstanding
Number Outstanding (in shares)	160
Weighted Average Remaining Contractual Life	8 years 3 months 11 days
Weighted Average Exercise Price (in dollars per share)	$ 54.76
Options Exercisable
Number Exercisable (in shares)	31
Weighted Average Exercise Price (in dollars per share)	$ 54.76
$57.47-$60.10
Information about options outstanding
Low end of exercise price range (in dollars per share)	$ 57.47
High end of exercise price range (in dollars per share)	$ 60.10
Options Outstanding
Number Outstanding (in shares)	130
Weighted Average Remaining Contractual Life	9 years 4 months 21 days
Weighted Average Exercise Price (in dollars per share)	$ 57.68
Options Exercisable
Number Exercisable (in shares)	8
Weighted Average Exercise Price (in dollars per share)	$ 57.95