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Common Stock (Schedule of Stock Option Exercise Prices) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Amount Outstanding (in shares) | shares 561
Weighted Average Exercise Price (in dollars per share) $ 20.99
Amount Exercisable (in shares) | shares 537
Weighted Average Exercise Price (in dollars per share) $ 19.49
$0.01-5.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 0.01
Range of exercise prices, maximum (in dollars per share) $ 5.00
Amount Outstanding (in shares) | shares 100
Weighted Average Remaining Contractual Life (Years) 3 years 2 months
Weighted Average Exercise Price (in dollars per share) $ 3.38
Amount Exercisable (in shares) | shares 100
Weighted Average Exercise Price (in dollars per share) $ 3.38
5.01-10.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 5.01
Range of exercise prices, maximum (in dollars per share) $ 10.00
Amount Outstanding (in shares) | shares 189
Weighted Average Remaining Contractual Life (Years) 4 years 2 months
Weighted Average Exercise Price (in dollars per share) $ 8.32
Amount Exercisable (in shares) | shares 189
Weighted Average Exercise Price (in dollars per share) $ 8.32
10.01-15.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 10.01
Range of exercise prices, maximum (in dollars per share) $ 15.00
Amount Outstanding (in shares) | shares 14
Weighted Average Remaining Contractual Life (Years) 3 years 1 month
Weighted Average Exercise Price (in dollars per share) $ 14.45
Amount Exercisable (in shares) | shares 14
Weighted Average Exercise Price (in dollars per share) $ 14.45
15.01-20.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 15.01
Range of exercise prices, maximum (in dollars per share) $ 20.00
Amount Outstanding (in shares) | shares 20
Weighted Average Remaining Contractual Life (Years) 3 years 8 months
Weighted Average Exercise Price (in dollars per share) $ 15.58
Amount Exercisable (in shares) | shares 20
Weighted Average Exercise Price (in dollars per share) $ 15.58
25.01-30.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 25.01
Range of exercise prices, maximum (in dollars per share) $ 30.00
Amount Outstanding (in shares) | shares 51
Weighted Average Remaining Contractual Life (Years) 3 years 6 months
Weighted Average Exercise Price (in dollars per share) $ 25.85
Amount Exercisable (in shares) | shares 51
Weighted Average Exercise Price (in dollars per share) $ 25.85
30.01-35.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 30.01
Range of exercise prices, maximum (in dollars per share) $ 35.00
Amount Outstanding (in shares) | shares 62
Weighted Average Remaining Contractual Life (Years) 5 years 2 months
Weighted Average Exercise Price (in dollars per share) $ 31.49
Amount Exercisable (in shares) | shares 62
Weighted Average Exercise Price (in dollars per share) $ 31.49
40.01-45.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 40.01
Range of exercise prices, maximum (in dollars per share) $ 45.00
Amount Outstanding (in shares) | shares 51
Weighted Average Remaining Contractual Life (Years) 6 years 1 month
Weighted Average Exercise Price (in dollars per share) $ 41.25
Amount Exercisable (in shares) | shares 51
Weighted Average Exercise Price (in dollars per share) $ 41.25
50.01-55.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum (in dollars per share) 50.01
Range of exercise prices, maximum (in dollars per share) $ 55.00
Amount Outstanding (in shares) | shares 74
Weighted Average Remaining Contractual Life (Years) 7 years 2 months
Weighted Average Exercise Price (in dollars per share) $ 53.78
Amount Exercisable (in shares) | shares 50
Weighted Average Exercise Price (in dollars per share) $ 53.78