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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Changes in Cash Flows Related Accounting Standard Adoption
The following table illustrates changes in the Company’s cash flows as reported and as previously reported prior to the adopted the Cash Flow ASUs during the fourth quarter of 2017 (in thousands):
 
 
Year Ended
 
 
December 31, 2016
 
December 31, 2015
Net cash provided by (used in):
 
As Reported
 
As Previously Reported
 
As Reported
 
As Previously Reported
Net cash provided by (used in) investing activities
    
$
(428,973
)
    
$
(410,617
)
 
$
(1,660,365
)
    
$
(1,672,005
)
Net increase (decrease) in balance(1)
 
(270,126
)
 
(251,770
)
 
174,330

 
162,690

Balance - beginning of year(1)
 
407,116

 
346,500

 
232,786

 
183,810

Balance - end of year(1)
 
136,990

 
94,730

 
407,116

 
346,500

Balance - continuing operations, end of year(1)
 
136,990

 
94,730

 
401,058

 
340,442

_______________________________________
(1)
Amounts in the As Reported column include cash and cash equivalents and restricted cash as required upon the adoption of the Cash Flow ASUs. Amounts in the As Previously Reported column reflects only cash and cash equivalents.