Intangible Assets and Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Intangible Assets Other Than Goodwill
The following table presents the changes in intangible assets, other than goodwill, for the years ended December 31, 2015 and 2014 (dollars in thousands):
 
Indefinite-Lived
 
Definite-Lived
 
Total
Intangible Assets:
 
 
 
 
 
Balance as of January 1, 2014
$
1,596,337

 
$
315,490

 
$
1,911,827

Purchase price allocation adjustments
963

 
—

 
963

Acquisitions
—

 
8,205

 
8,205

Dispositions
(585
)
 
(74
)
 
(659
)
Amortization
—

 
(79,981
)
 
(79,981
)
Balance as of December 31, 2014
$
1,596,715

 
$
243,640

 
$
1,840,355

Balance as of January 1, 2015
$
1,596,715

 
$
243,640

 
$
1,840,355

Impairment
(15,873
)
 
—

 
(15,873
)
Disposition
(2,776
)
 
—

 
(2,776
)
Amortization
—

 
(69,110
)
 
(69,110
)
Balance as of December 31, 2015
$
1,578,066

 
$
174,530

 
$
1,752,596
Schedule of changes in goodwill and accumulated impairment losses
The following table presents the changes in goodwill and accumulated impairment losses for the years ended December 31, 2015 and 2014 (dollars in thousands):
 
2015
 
2014
Balance as of January 1:
 
 
 
Goodwill
$
1,583,564

 
$
1,586,482

Accumulated impairment losses
(329,741
)
 
(329,741
)
Subtotal
1,253,823

 
1,256,741

Acquisitions
—

 
886

Purchase price allocation adjustments
371

 
(3,188
)
Disposition
(1,129
)
 
(616
)
Impairment losses
(549,711
)
 
—

Balance as of December 31:
 
 
 
Goodwill
1,582,806

 
1,583,564

Accumulated impairment losses
(879,452
)
 
(329,741
)
Total
$
703,354

 
$
1,253,823
Estimated Future Amortization Expense
As of December 31, 2015, estimated future amortization expense related to intangible assets subject to amortization was as follows (dollars in thousands):
2016
$
56,315

2017
33,704

2018
18,400

2019
17,456

2020
17,396

Thereafter
31,259

Total other intangibles, net
$
174,530