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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Nov. 10, 2016
Jun. 30, 2016
Dec. 31, 2014
Dec. 03, 2013
Aug. 30, 2013
Aug. 20, 2010
Aug. 12, 2010
$400 Million Credit Facility | Secured Debt                  
Maximum borrowing capacity $ 400,000 $ 400,000 $ 400,000            
$100 Million Term Loan Facility | Secured Debt                  
Maximum borrowing capacity       $ 100,000         $ 100,000
$253 Million Term Loan Facility | Secured Debt                  
Maximum borrowing capacity       253,000       $ 253,000  
$44 Million Term Loan Facility | Secured Debt                  
Maximum borrowing capacity       44,000   $ 44,000      
$148 Million Credit Facility | Line of Credit Facility                  
Maximum borrowing capacity       148,000 $ 148,000        
$22 Million Term Loan Facility | Secured Debt                  
Maximum borrowing capacity       $ 22,000     $ 22,000