Shareholder's Equity (Schedule of Stock Option Activity (Parenthetical) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Shareholders' Equity
Total intrinsic value with options exercised	$ 33,349,000	$ 6,287,000	$ 2,482,000
Aggregate intrinsic value of options outstanding	6,156,000
Total intrinsic value of options vested or expected to vest	6,156,000
Total intrinsic value of options exercisable	$ 6,156,000