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Incentive Plans (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unvested share-based compensation arrangements, compensation costs to be expensed $ 28,458,000    
Unvested share-based compensation arrangements, number of years compensation costs to be expensed 2 years    
Income tax benefits realized option exercises $ 0 $ 36,000 $ 5,364,000
Vesting scheme Under these plans, one-half of each grant is generally exercisable after two years and the remainder after three years.    
Total intrinsic value of options exercised $ 0 $ 221,000 $ 12,003,000
Stock options exercised [1] 15,575 119,994
Share based compensation settled in cash $ 17,181,000 $ 1,594,000 $ 9,667,000
Incentive compensation plan expense $ 25,800,000 $ 26,393,000 $ 38,000,000
Share-based Compensation Award, Tranche One [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 2 years    
Share-based Compensation Award, Tranche Two [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 3 years    
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Option term 7 years    
2012 Long-Term Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Long term plan expiration year 2022    
Maximum number of shares available for issuance 8,700,000    
Maximum number of shares available for issuance, annual rate 1.00%    
Number of shares available 3,000,000    
Employee Stock Purchase Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Salary that can be withheld by eligible employee for stock purchase 10.00%    
Stock purchase price, percentage of the fair value of the stock 90.00%    
Employee Stock purchase plan, termination date The ESPP will terminate on the earlier of the date that employees have purchased all 980,000 authorized shares or June 30, 2017.    
Employee stock purchases, shares 8,962 8,387 6,739
Employee stock purchases, price per share $ 23.41 $ 34.93 $ 56.22
Number of shares available 262,853    
Compensation costs estimation Compensation costs related to the ESPP are estimated based on the value of the 10% discount and the fair value of the option that provides for the refund of participant withholdings    
Discount percentage 10.00%    
Compensation expenses $ 41,000 $ 29,000 $ 55,000
Fair value per share issued under ESPP $ 2.94 $ 5.74 $ 6.49
Employee Stock Purchase Plan [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Maximum number of shares available for issuance 980,000    
2012 Long-Term Plan and the 2007 Long-Term Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Option granted to date, term of years 7 years    
2012 Long-Term Plan and the 2007 Long-Term Plan [Member] | Share-based Compensation Award, Tranche One [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting percentage 50.00%    
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise price of options granted $ 17.57 $ 49.67 $ 55.82
Granted stock options, valuation per option $ 5.03    
Stock-based compensation, fair value assumption model Black-Scholes option pricing model    
Stock options exercised   32,349 862,407
Stock Options [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted stock options, valuation per option   $ 10.97 $ 12.84
Vesting period 2 years    
Stock Options [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted stock options, valuation per option   11.08  
Vesting period 3 years    
Time-Lapse Restricted Stock and Restricted Stock Units [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 17.57 49.67  
Time-Lapse Restricted Stock and Restricted Stock Units [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date     55.20
Time-Lapse Restricted Stock and Restricted Stock Units [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date     60.85
Performance Based Restricted Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 3 years    
Stock-based compensation, fair value assumption model Monte Carlo valuation model    
Performance Based Restricted Stock [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 12.21 44.03 33.90
Performance Based Restricted Stock [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value per share at grant date $ 16.34 $ 48.12 $ 51.30
[1] Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note J due to withholdings for statutory income taxes owed upon issuance of shares.