Stockholders Equity (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013
$ 8.00 to $24.99 [Member]
Stock options outstanding
Number of Outstanding Options	430,730
Weighted Average Remaining Contractual Life	5 years 2 months 16 days
Weighted Average Exercise	$ 20.04
Number of Exercisable Options	430,730
Exercisable Options, Weighted Average Exercise Price	$ 20.04
$25.00 to $44.99 [Member]
Stock options outstanding
Number of Outstanding Options	1,051,893
Weighted Average Remaining Contractual Life	5 years 4 months 20 days
Weighted Average Exercise	$ 38.72
Number of Exercisable Options	765,550
Exercisable Options, Weighted Average Exercise Price	$ 40.00
$45.00 to $65.00 [Member]
Stock options outstanding
Number of Outstanding Options	5,691
Weighted Average Remaining Contractual Life	1 year 3 months 7 days
Weighted Average Exercise	$ 55.98
Number of Exercisable Options	5,691
Exercisable Options, Weighted Average Exercise Price	$ 55.98
$ 8.00 to $65.00 [Member]
Stock options outstanding
Number of Outstanding Options	1,488,314
Weighted Average Remaining Contractual Life	5 years 4 months
Weighted Average Exercise	$ 33.38
Number of Exercisable Options	1,201,971
Exercisable Options, Weighted Average Exercise Price	$ 32.93