Cash Dividends (Tables)

6 Months Ended

Jun. 30, 2014

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	188.812	$	5.30	June 3, 2014
May 2015 Notes	165.4367	$	6.04	June 3, 2014