Note 16. Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Stock Repurchased During Period, Shares		9.4
Payments for Repurchase of Common Stock		$ 100,188	$ 0
Accelerated Share Repurchases, Final Price Paid Per Share		$ 10.62
Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Debt Instrument, Repurchase Amount	$ 30,100	$ 30,100
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	0.2
Convertible Debt, Termination of Capped Call Transaction, Total Consideration	$ 2,600
Convertible Debt, Termination of Capped Call Transaction, Closing Stock Price	$ 11.86	$ 11.86
Convertible Senior Notes Due 2019
Class of Stock [Line Items]
Debt Instrument, Repurchase Amount	$ 288,400	$ 288,400
Convertible Debt [Member]
Class of Stock [Line Items]
Repayments of Convertible Debt	$ 191,500
Debt Conversion, Converted Instrument, Shares Issued	17.0
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Debt Instrument, Repurchase Amount	$ 30,100	30,100
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Class of Stock [Line Items]
Debt Instrument, Repurchase Amount	$ 288,400	$ 288,400