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Summary of Significant Accounting Policies Equity and Accumulated Other Comprehensive Loss Common Share Repurchase (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 06, 2020
Feb. 25, 2020
Feb. 24, 2020
May 07, 2019
Mar. 31, 2020
Mar. 03, 2020
Oct. 26, 2018
Stock Repurchase Program, Authorized Amount     $ 50,000       $ 50,000
Payments for repurchase of common stock         $ 4,995    
Weighted average price of common shares   364,604          
Period over which shares will be repurchased     18 months        
Accelerated Share Repurchase Agreement [Member]              
Payments for repurchase of common stock       $ 50,000      
Stock repurchased and retired during period, shares       1,349,528      
Percentage of expected shares repurchased       80.00%      
Treasury stock, retired, cost method, amount       $ 40,000      
Equity increase (decrease) related to shares repurchase program.       $ 10,000      
Agreement Letter 10b18 [Member]              
Stock Repurchase Program, Authorized Amount           $ 5,000  
Treasury stock, retired, cost method, amount $ 4,995            
Total company common shares 242,634            
Treasury shares              
Treasury stock, retired, cost method, amount   $ (10,000)          
Additional Paid-In Capital              
Treasury stock, retired, cost method, amount   $ 10,000          
Additional Paid-In Capital | Agreement Letter 10b18 [Member]              
Treasury stock, retired, cost method, amount $ 4,995