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Stock Incentive Plan
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Stock Incentive Plan Stock Incentive Plan
Pursuant to the Company's stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. The following table summarizes RSU information for the three years ended December 31, 2019:
 
2019
 
2018
 
2017
RSUs granted and unvested at beginning of period:
5,062,661

 
5,216,972

 
7,293,147

Granted
840,796

 
1,140,048

 
1,283,976

Vested
(1,447,522
)
 
(900,254
)
 
(2,990,261
)
Canceled
(331,675
)
 
(394,105
)
 
(369,890
)
RSUs granted and unvested at end of period:
4,124,260

 
5,062,661

 
5,216,972


    
Upon vesting, shares of the Company’s common stock equal to the number of vested RSUs are issued or deferred to a later date, depending on the terms of the specific award agreement. As of December 31, 2019, 7,532,977 RSUs had been deferred. RSUs that have not yet vested and vested RSUs that have been deferred are not considered to be issued and outstanding shares.

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, 2019:
(In thousands)
2019
 
2018
 
2017
Unearned compensation at beginning of year
$
129,669

 
$
122,910

 
$
115,965

RSUs granted, net of cancellations
53,583

 
52,204

 
52,897

  RSUs expensed
(47,329
)
 
(34,408
)
 
(38,796
)
  RSUs forfeitures
(7,533
)
 
(11,037
)
 
(7,156
)
Unearned compensation at end of year
$
128,390

 
$
129,669

 
$
122,910