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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Disclosure
The following table presents the changes in the carrying amount of goodwill for the period indicated:    
 
Goodwill
 
(In thousands)
Balance, December 31, 2015
$
2,176,291

Reduction due to sale of PWEF leasing unit
(500
)
Balance, March 31, 2016
$
2,175,791
Intangible Assets Disclosure
The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated:
 
Three Months Ended
 
March 31,
 
December 31,
 
March 31,
 
2016
 
2015
 
2015
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of period
$
95,524

 
$
53,090

 
$
53,090

Additions
—

 
45,426

 
—

Fully amortized portion
—

 
(2,992
)
 
—

Reduction due to sale of PWEF leasing unit
(1,700
)
 
—

 
—

Balance, end of period
93,824

 
95,524

 
53,090

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of period
(42,304
)
 
(40,386
)
 
(35,886
)
Amortization
(4,746
)
 
(4,910
)
 
(1,501
)
Fully amortized portion
—

 
2,992

 
—

Reduction due to sale of PWEF leasing unit
1,363

 
—

 
—

Balance, end of period
(45,687
)
 
(42,304
)
 
(37,387
)
Net CDI and CRI, end of period
$
48,137

 
$
53,220

 
$
15,703