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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Accumulated depreciation $ 464,970 $ 402,338
Common stock    
Par value (in dollars per share) $ 0.01 $ 0.01
Shares authorized (in shares) 250,000,000 250,000,000
Shares issued (in shares) 189,515,024 178,306,528
Shares outstanding (in shares) 189,515,024 178,306,528