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Senior Notes Senior Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 02, 2013
Nov. 02, 2010
Senior Notes [Line Items]          
Senior note redemption price, percent 100.00%        
Senior notes, net $ 540,000        
Write-off of debt financing fees 2,168 $ 475 $ 1,936    
Senior Notes Due 2020 [Member]          
Senior Notes [Line Items]          
Initial borrowing in senior notes         $ 300,000
Senior Notes Due 2021 [Member]          
Senior Notes [Line Items]          
Initial borrowing in senior notes       $ 250,000  
Write-off of debt financing fees $ 2,000