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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement, Early Adoption [Table Text Block]
Prior periods have been adjusted to reflect this adoption, as detailed below:
 
Year Ended December 31, 2015
 
Year Ended December 31, 2014
 
As
 
 
 
 
 
As
 
 
 
 
 
Previously
 
 
 
As
 
Previously
 
 
 
As
(in thousands)
Reported
 
Adjustment
 
Adopted
 
Reported
 
Adjustment
 
Adopted
Cash Flows from Operating Activities
  
 
  
 
  
 
  
 
  
 
  
Decrease in Restricted Cash
$
4,153

 
(4,153
)
 
$
—

 
$
58,871

 
(58,871
)
 
$
—

Net Cash Provided by Operating Activities
74,804

 
(4,153
)
 
70,651

 
372,370

 
(58,871
)
 
313,499

 
 
 
 
 
 
 
 
 
 
 
 
Net (Decrease) Increase in Cash and Cash Equivalents and Restricted Cash
(19,779
)
 
(4,153
)
 
(23,932
)
 
204,267

 
(58,871
)
 
145,396

Cash and Cash Equivalents and Restricted Cash at Beginning of Year
773,986

 
24,898

 
798,884

 
569,719

 
83,769

 
653,488

Cash and Cash Equivalents and Restricted Cash at End of Year
754,207


20,745


774,952

 
773,986

 
24,898

 
798,884