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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Restrictions on Cash and Cash Equivalents The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
(in thousands)
Cash and cash equivalents
$
120,221

 
$
176,274

 
$
133,565

Current restricted cash included in other current assets
51

 
51

 
—

Long-term restricted cash
2,056

 
311,010

 
—

Total cash, cash equivalents, and restricted cash:
$
122,328

 
$
487,335

 
$
133,565