Property Disposition (Tables)
 12 Months Ended
Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Disposal Groups, Including Discontinued Operations
The results of operations for properties that have been sold or classified as held for sale are included in the consolidated financial statements and are summarized as follows (in thousands):
 
Years Ended December 31,
 
2016
 
2015
 
2014
Revenues
$
32,170

 
$
37,062

 
$
39,211

Expenses
(27,415
)
 
(32,457
)
 
(37,570
)
Gain on sale of real estate, net of tax
132,858

 
2,197

 
13,338

Impairment charges
(29,183
)
 
—

 
—

Loss on extinguishment of debt
(15,807
)
 
—

 
—

Provision for income taxes
(24
)
 
(4
)
 
(29
)
Income from properties sold or classified as held for sale, net of income taxes
$
92,599

 
$
6,798

 
$
14,950