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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Changes in Each Class of Shares Issued and Outstanding
The table below shows the changes in each class of shares issued and outstanding:
 
Years ended December 31,
 
2016
 
2015
 
2014
Class A
 
 
 
 
 
Beginning balance
50,151,265

 
15,752,736

 
494,200

Issued shares
3,360,471

 
34,498,220

 
11,950,844

Forfeited shares
(37,188
)
 
—

 
—

Repurchased shares
(313,313
)
 
(99,691
)
 
—

Converted from Class B shares
24,158,146

 
—

 
3,307,692

Ending balance
77,319,381

 
50,151,265

 
15,752,736

Class B
 
 
 
 
 
Beginning balance
135,963,975

 
125,282,892

 
114,605,747

Issued shares
—

 
10,681,083

 
16,981,664

Repurchased shares
—

 
—

 
(2,996,827
)
Converted to Class A shares
(24,158,146
)
 
—

 
(3,307,692
)
Ending balance
111,805,829

 
135,963,975

 
125,282,892

Class M-1
 
 
 
 
 
Beginning balance
5,198,273

 
5,198,273

 
5,198,273

Converted to Class A shares
(1,155,303
)
 
—

 
—

Forfeited shares
(270,543
)
 
—

 
—

Repurchased shares
(298,222
)
 
—

 
—

Ending balance
3,474,205

 
5,198,273

 
5,198,273

Class M-2
 
 
 
 
 
Beginning balance
3,125,869

 
3,125,869

 
3,226,792

Converted to Class A shares
(1,788,998
)
 
—

 
—

Forfeited shares
(161,474
)
 
—

 
(80,738
)
Repurchased shares
(107,650
)
 
—

 
(20,185
)
Ending balance
1,067,747

 
3,125,869

 
3,125,869

Class M-3
 
 
 
 
 
Beginning balance
3,110,000

 
3,350,000

 
—

Issued shares
—

 
—

 
3,390,000

Converted to Class A shares
(1,443,700
)
 
—

 
—

Forfeited shares
(224,000
)
 
(216,000
)
 
(32,000
)
Repurchased shares
(96,000
)
 
(24,000
)
 
(8,000
)
Ending balance
1,346,300

 
3,110,000

 
3,350,000

Class M-4
 
 
 
 
 
Beginning balance
5,038,443

 
—

 
—

Issued shares
990,650

 
5,316,751

 
—

Converted to Class A shares
(79,031
)
 
—

 
—

Forfeited shares
(452,528
)
 
(242,050
)
 
—

Repurchased shares
(99,732
)
 
(36,258
)
 
—

Ending balance
5,397,802

 
5,038,443

 
—