Shareholders' Equity (Market Value of Company Common Stock and Settlement Rate) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Applicable market value of Company common stock less than or equal to $30.00 [Member]
Shareholders' Equity [Line Items]
Settlement rate	1.6666
Applicable market value of Company common stock greater than $30.00 but less than $37.50 [Member]
Shareholders' Equity [Line Items]
Settlement rate, market value	50
Applicable market value of Company common stock greater than or equal to $37.50 [Member]
Shareholders' Equity [Line Items]
Settlement rate	1.3333
Maximum [Member]
Shareholders' Equity [Line Items]
Settlement rate	1.6666
Applicable market value of Company common stock, per share	37.50
Minimum [Member]
Shareholders' Equity [Line Items]
Settlement rate	1.3333
Applicable market value of Company common stock, per share	30