Earning Per Share (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2011 Convertible note premium	Sep. 30, 2014 Convertible note premium	Sep. 30, 2014 Stock options	Sep. 30, 2013 Stock options	Sep. 30, 2014 Stock options	Sep. 30, 2013 Stock options	Sep. 30, 2014 Deferred stock	Sep. 30, 2013 Deferred stock	Sep. 30, 2014 Deferred stock	Sep. 30, 2013 Deferred stock	Sep. 30, 2014 Restricted stock	Sep. 30, 2013 Restricted stock	Sep. 30, 2014 Restricted stock	Sep. 30, 2013 Restricted stock	Sep. 30, 2014 Convertible note premium	Sep. 30, 2013 Convertible note premium	Sep. 30, 2014 Convertible note premium	Sep. 30, 2013 Convertible note premium	Sep. 30, 2014 Warrants	Sep. 30, 2013 Warrants	Sep. 30, 2014 Warrants	Sep. 30, 2013 Warrants
Convertible Note transaction
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	0	0	522,000	0	0	0	58,000	7,000	1,031,000	2,000	1,494,000	0	10,943,000	0	10,943,000	0	10,943,000	0	10,943,000
Stated interest rate (as a percent)	5.00%
Principal amount	$ 86.25
Number of shares in which the entity entered into separate convertible note hedge transactions and separate warrant transactions	10,900,000
Conversion price (in dollars per share)		$ 7.88
Class of Warrant or Right, Exercise Price of Warrants or Rights																			$ 10.00		$ 10.00