Shareholders' Equity - Activity of Options (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Options
Options, Outstanding at beginning of period | shares	20,577
Options, Granted | shares	610
Options, Exercised | shares	(164)
Options, Forfeited or expired | shares	(2,784)
Options, Outstanding at end of period | shares	18,239
Options, Exercisable at end of period | shares	17,253
Options, Exercisable and expected to vest at period end | shares	18,188
Wtd. Avg. Exercise Price
Wtd. Avg. Exercise Price, Outstanding at beginning of period | $ / shares	$ 34.89
Wtd. Avg. Exercise Price, Granted | $ / shares	32.10
Wtd. Avg. Exercise Price, Exercised | $ / shares	28.31
Wtd. Avg. Exercise Price, Forfeited or expired | $ / shares	40.53
Wtd. Avg. Exercise Price, Outstanding at end of period | $ / shares	33.99
Wtd. Avg. Exercise Price, Exercisable at end of period | $ / shares	33.97
Wtd. Avg. Exercise Price, Exercisable and expected to vest at end of period | $ / shares	$ 33.99