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Restricted Stock Units
6 Months Ended
Jun. 30, 2017
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 $21 million and $16 million for the six months ended June 30, 2017 and 2016, respectively. A summary of RSUs issued in the six months ended June 30, 2017 and 2016 follows:
 
($ in thousands)
Units
 
Fair Value
2017
6,020

 
$
405

2016
17,654

 
$
964