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Restricted Stock Units Restricted Stock Units (Notes)
9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Units
Restricted Stock Units
Pursuant to its 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. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $23 million and $20 million for the nine months ended September 30, 2015 and 2014, respectively. A summary of RSUs issued in the nine months ended September 30, 2015 and 2014 follows:
 
($ in thousands)
Units
 
Fair Value
Nine months ended September 30,
 
 
 
2015
971,457

 
$
54,439

2014
1,135,900

 
$
50,791