Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Cash-Settled RSU Awards (Details)

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Share-Based Compensation - Cash-Settled RSU Awards (Details) - Cash-Settled RSUs - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash-Settled RSU Awards (in thousands)        
Unvested, beginning of the period (in shares) 194,000 171,000 196,000 86,000
Granted (in shares) 3,000 39,000 3,000 125,000
Vested (in shares) 0 (1,000) (1,000) (2,000)
Did not vest at end of performance period (in shares) 0 (1,000) (1,000) (1,000)
Forfeited (in shares) (23,000) 0 (23,000) 0
Unvested, end of the period (in shares) 174,000 208,000 174,000 208,000
Weighted Average Grant Date Fair Value        
Unvested, beginning of the period (in dollars per share) $ 47.15 $ 78.54 $ 47.56 $ 124.22
Granted (in dollars per share) 36.71 20.33 36.71 29.76
Vested (in dollars per share) 0 166.60 110.48 126.51
Did not vest at end of performance period (in dollars per share) 0 166.60 110.48 166.60
Forfeited (in dollars per share) 54.57 0 54.57 0
Unvested, end of the period (in dollars per share) $ 45.93 $ 67.20 $ 45.93 $ 67.20
Non-employee director | Amended and Restated Deferred Compensation Plan        
Cash-Settled RSU Awards (in thousands)        
Granted (in shares) 3,200 12,700 3,200 13,700