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Equity-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Activity for Share-based Compensation
The following table details the activity of the LTI Target Awards during the year ended December 31, 2017.
 
Market-Based Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
 
LTI Target Awards
 
Weighted-Average Grant Date Fair Value
Unvested units, December 31, 2015
704,804

 
$
8.58

 
731,448

 
$
11.38

Granted
—

 
—

 
855,471

 
7.14

Vested
(610,839
)
 
8.58

 
(8,065
)
 
11.44

Forfeited
(93,965
)
 
8.58

 
(56,367
)
 
11.15

Unvested units, December 31, 2016
—

 
$
—

 
1,522,487

 
$
9.00

Granted
—

 
—

 
726,867

 
8.96

Forfeited or canceled
—

 
—

 
(675,125
)
 
11.34

Unvested units, December 31, 2017
$
—

 
$
—

 
1,574,229

 
$
7.98

The following table details the activity of the Restricted Shares during the year ended December 31, 2017:
 
 
Restricted Shares
 
Weighted-Average Grant Date Fair Value
Unvested shares, December 31, 2015
 
1,239,662

 
$
13.86

Granted
 
—

 
—

Vested
 
(586,863
)
 
13.91

Forfeited
 
(90,393
)
 
14.08

Unvested shares, December 31, 2016
 
562,406

 
$
13.78

Granted
 
—

 
—

Vested
 
(266,378
)
 
13.55

Forfeited
 
(61,600
)
 
13.98

Unvested shares, December 31, 2017
 
234,428

 
$
13.98

The following table details the activity of the Time-Based Restricted Stock Units and Deferred Stock Units during the year ended December 31, 2017.
 
 
Time-Based Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
 
Deferred Stock Units
 
Weighted-Average Grant Date Fair Value
Unvested units, December 31, 2015
 
589,138

 
$
9.61

 
—

 
$
—

Granted
 
736,427

 
7.82

 
87,513

 
9.18

Vested
 
(199,556
)
 
9.52

 
(87,513
)
 
9.18

Forfeited
 
(40,095
)
 
8.68

 
—

 
—

Unvested units, December 31, 2016
 
1,085,914

 
$
8.43

 
—

 
$
—

Granted
 
673,381

 
8.90

 
127,588

 
8.22

Vested
 
(425,967
)
 
8.61

 
(127,588
)
 
8.22

Forfeited
 
(20,463
)
 
8.54

 
—

 
—

Unvested units, December 31, 2017
 
1,312,865

 
$
8.61

 
—

 
$
—