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Earnings Per Share (Details) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method        
Document Period End Date     Sep. 30, 2020  
Reconciliation of Weighted-Average Diluted Shares Outstanding        
Weighted Average Number of Shares Outstanding, Basic 99,617 62,547 97,762 64,835
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 32 0 0
Anti-dilutive Effect        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,054 1,214 1,946 1,282
Convertible Senior Note        
Convertible Note, Shares To Be Received Upon Conversion (in thousands)     2,300  
Restricted stock        
Anti-dilutive Effect        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,831 947 1,715 980
Stock Appreciation Rights (SARs) [Member]        
Reconciliation of Weighted-Average Diluted Shares Outstanding        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 16 0 0
Anti-dilutive Effect        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 223 267 231 302
1.125% Convertible Senior Notes due 2021 [Member]        
Convertible Senior Note        
Convertible Note, Conversion Price $ 85.39   $ 85.39