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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Summary of New Accounting Pronouncement, Early Adoption
We early adopted both ASU 2016-18 and ASU 2016-15 on December 31, 2017 and made the following reclassifications to the prior years' consolidated statements of cash flows to conform to the current year's presentation (in thousands):
Statement of Cash Flow for the year ended December 31, 2016
 
Originally Reported
 
Effect of Change
 
As Adjusted
Cash provided by operating activities
 
$
163,016

 
$
687

 
$
163,703

Cash provided by investing activities
 
1,052,119

 
(26,400
)
 
1,025,719

Statement of Cash Flow for the year ended December 31, 2015
 
Originally Reported
 
Effect of Change
 
As Adjusted
Cash provided by operating activities
 
$
181,544

 
$
6,570

 
$
188,114

Cash provided by investing activities
 
1,648,893

 
203,709

 
1,852,602

Cash used in financing activities
 
(382,722
)
 
(210,291
)
 
(593,013
)