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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Restricted cash and cash equivalents    
Restricted cash and cash equivalents $ 123,877 $ 146,455
Restricted investments, short-term and long-term    
Short-term restricted investments 329,237 318,464
Long term restricted investments 6,178 10,111
Other current restricted assets    
Other current restricted assets $ 42,900 $ 38,602
Preferred stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 10,000 10,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 100,000 100,000
Common stock, issued (in shares) 54,631 54,285
Common stock, outstanding (in shares) 24,969 24,623
Treasury stock    
Treasury stock (in shares) 29,662 29,662