Cash Dividends (Tables)

9 Months Ended

Sep. 30, 2013

Stockholders' Equity Note [Abstract]

Schedule of Conversion Rates for Convertible Notes

Convertible Notes	Conversion Rate per $1,000 Principal Amount	Approximate Conversion Price Per Common Share		Effective Date
Series 2012 Notes	179.777	$	5.56	September 3, 2013
May 2015 Notes	157.3700	$	6.35	September 3, 2013