XML 106 R91.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Compensation - Restricted Stock Unit Activity (Details) - $ / shares
 12 Months Ended
May 18, 2016
May 04, 2016
Dec. 31, 2016
Restricted Stock Units      
Number of Shares (in thousands)      
Balance at beginning of period (in shares)     285,000
Granted (in shares)     153,000
Dividend reinvestment issuances (in shares)     13,000
Vested (in shares) (53,853) (101,210) (115,271)
Forfeited (in shares)     (73,000)
Balance at end of period (in shares)     263,000
Weighted Average Grant Date Fair Value      
Balance at beginning of period (in dollars per share)     $ 16.33
Granted (in dollars per share)     29.77
Dividend reinvestment issuances (in dollars per share)     26.84
Vested (in dollars per share)     27.66
Forfeited (in dollars per share)     18.47
Balance at end of period (in dollars per share)     $ 19.13
Restricted Stock Units, Liability Awards      
Number of Shares (in thousands)      
Balance at beginning of period (in shares)     100,000
Granted (in shares)     106,000
Dividend reinvestment issuances (in shares)     7,000
Vested (in shares)     (82,257)
Forfeited (in shares)     (5,000)
Balance at end of period (in shares)     126,000
Weighted Average Grant Date Fair Value      
Balance at beginning of period (in dollars per share)     $ 20.72
Granted (in dollars per share)     30.30
Dividend reinvestment issuances (in dollars per share)     30.30
Vested (in dollars per share)     27.18
Forfeited (in dollars per share)     30.30
Balance at end of period (in dollars per share)     $ 30.30