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Stock-Based Compensation Long-Term Performance Restricted Stock Unit Award Monte Carlo Pricing Model Assumptions (Details) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Long Term Performance Restricted Stock Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1]     196 319
Weighted average fair value(1) [1]     $ 41.58 $ 35.30
Restricted Stock Units (RSUs) [Member] | Long Term Performance Restricted Stock Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend yield(1) 0.00% 0.00% [2] 0.00% 0.00%
Expected volatility(1) 28.80% 0.00% [2] 30.00% 30.10%
Risk-free interest rate(1) 0.80% 0.00% [2] 0.70% 0.70%
Expected term (years)(1) 2 years 3 months 15 days 1 day [2] 1 year 10 months 2 years 1 month
Weighted average fair value(1) $ 63.10 $ 0.00 [2] $ 44.92 $ 33.48
[1] Restricted stock units granted in 2015 and 2016 do not include awards under the Performance Award Agreement for the respective years, as these awards are not granted until attainment of annual performance goals has been determined at the conclusion of the performance period, which had not occurred as of September 30, 2015 and 2016, respectively.
[2] There were no long-term performance restricted stock units granted for the three months ended September 30, 2015.