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Stock Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity The following table summarizes RSU information for the three years ended December 31, 2020:
202020192018
RSUs granted and unvested at beginning of period:4,124,260 5,062,661 5,216,972 
Granted962,453 840,796 1,140,048 
Vested(1,111,588)(1,447,522)(900,254)
Canceled(170,789)(331,675)(394,105)
RSUs granted and unvested at end of period:3,804,336 4,124,260 5,062,661 
Schedule of Share-based Compensation, Unearned Compensation Related to RSU's
The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2020:
(In thousands)202020192018
Unearned compensation at beginning of year$128,390 $129,669 $122,910 
RSUs granted, net of cancellations54,270 53,583 52,204 
  RSUs expensed(47,108)(47,329)(34,408)
  RSUs forfeitures(3,242)(7,533)(11,037)
Unearned compensation at end of year$132,310 $128,390 $129,669