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Fair Value Measurements (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Assets measured at fair value on a nonrecurring basis
Assets measured at fair value on a nonrecurring basis at September 30, 2017 and December 31, 2016, respectively, are set forth below:
 
 
 
Estimated fair value measurements
 
 
 
Balance
 
Quoted prices in
active market
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant other
unobservable inputs
(Level 3)
 
Total gains
(losses)
($ in thousands)
 
 
 
 
 
 
 
 
 
September 30, 2017:
 
 
 
 
 
 
 
 
 
Property and equipment, net
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Goodwill
$
—

 
$
—

 
$
—

 
$
—

 
$
—

December 31, 2016:
 
 
 
 
 
 
 
 
 
Property and equipment, net
$
8,700

 
$
—

 
$
8,700

 
$
—

 
$
(6,305
)
Goodwill
$
9,425

 
$
—

 
$
—

 
$
9,425

 
$
(1,177
)
Assets measured at fair value on a nonrecurring basis at December 31, 2016 and 2015, respectively, are set forth below:
 
 
 
Estimated fair value measurements
 
 
 
Carrying
Value
 
Quoted prices in
active market
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant other
unobservable inputs
(Level 3)
 
Total gains
(losses)
2016:
 
 
 
 
 
 
 
 
 
Property and equipment, net
$
8,700,000

 
$
—

 
$
8,700,000

 
$
—

 
$
(6,305,426
)
Goodwill
$
9,424,999

 
$
—

 
$
—

 
$
9,424,999

 
$
(1,177,148
)
2015:
 
 
 
 
 
 
 
 
 
Property and equipment, net
$
291,838,498

 
$
—

 
$
291,838,498

 
$
—

 
$
(36,609,332
)