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Stockholders' Equity - Nonvested Performance Based Units Activity By Grant Year (Details) - PSUs
shares in Thousands
6 Months Ended
Jun. 30, 2018
shares
Number of Performance Stock Units  
Number of units, beginning balance (in shares) 1,367
Number of units granted (in shares) 505
Number of units released (in shares) (28)
Number units canceled (in shares) (602)
Number of units, ending balance (in shares) 1,242
2015  
Number of Performance Stock Units  
Number of units, beginning balance (in shares) 77
Number of units granted (in shares) 0
Number of units released (in shares) 0
Number units canceled (in shares) (77)
Number of units, ending balance (in shares) 0
2016  
Number of Performance Stock Units  
Number of units, beginning balance (in shares) 420
Number of units granted (in shares) 0
Number of units released (in shares) (28)
Number units canceled (in shares) (194)
Number of units, ending balance (in shares) 198
2017  
Number of Performance Stock Units  
Number of units, beginning balance (in shares) 869
Number of units granted (in shares) 0
Number of units released (in shares) 0
Number units canceled (in shares) (331)
Number of units, ending balance (in shares) 538
2018  
Number of Performance Stock Units  
Number of units, beginning balance (in shares) 0
Number of units granted (in shares) 505
Number of units released (in shares) 0
Number units canceled (in shares) 0
Number of units, ending balance (in shares) 505