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Schedule I - Condensed Financial Information of Registrant (Tables)
 12 Months Ended
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 
For the Year ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Cash paid during the year for:
 
 
 
 
 
Interest
$
1,120,191

 
$
957,140

 
$
980,266

Income tax payments (refunds), net
$
15,361

 
$
(13,738
)
 
$
510
Parent Company  
Condensed Financial Statements, Captions [Line Items]  
Supplemental Cash Flow Information
Supplemental cash flow information related to the Parent Company for the years ended December 31, 2017, 2016 and 2015 is as follows (in thousands):
 
2017
 
2016
 
2015
Cash paid during the year for:
 

 
 

 
 

Interest
$
57,813

 
$
57,813

 
$
95,074

Income tax payments (refunds), net
$
1,440

 
$
(10,199
)
 
$
(2,332
)
 
 
 
 
 
 
Non-cash investing activities:
 

 
 

 
 

Investments contributed to subsidiary
$
25,328

 
$
423,009

 
$
—

Investments transferred from subsidiary
$
—

 
$
2,022

 
$
—

Dividends received from subsidiaries
$
32,792

 
$
—

 
$
—