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Equity Incentive Awards (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Incentive Awards [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
 
 
2018
 
2017
 
2016
(in thousands, except exercise price data)
 
Options
 
Weighted Average Exercise Price
 
Options
 
Weighted Average Exercise Price
 
Options
 
Weighted Average Exercise Price
Outstanding at beginning of year
 
4,961

 
$
11.17

 
4,834

 
$
11.24

 
4,217

 
$
12.35

Granted
 
1,916

 
10.00

 
892

 
14.31

 
1,370

 
10.40

Exercised
 
(97
)
 
7.55

 
(458
)
 
11.97

 
(495
)
 
12.17

Expired
 
(239
)
 
14.21

 
(157
)
 
26.42

 
(195
)
 
27.33

Forfeited
 
(389
)
 
12.04

 
(150
)
 
13.84

 
(63
)
 
10.45

Outstanding at end of year
 
6,152

 
10.68

 
4,961

 
11.17

 
4,834

 
11.24

Exercisable at end of year
 
3,620

 
$
10.72

 
3,077

 
$
10.95

 
2,727

 
$
12.55
Schedule of Nonvested Restricted Stock Units Activity
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
 
(in thousands)
 
 
Outstanding at December 31, 2017
 
946

 
$
10.50

Granted
 
872

 
9.79

Vested
 
(334
)
 
9.85

Forfeited
 
(198
)
 
10.59

Outstanding at December 31, 2018
 
1,286

 
$
10.17