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Stockholders' Equity - Reconciliation of beginning and ending common stock outstanding (Details) - shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]    
Document Period End Date Jun. 30, 2019  
Reconciliation of the beginning and ending common stock outstanding    
Balance, beginning of period 125,279,000  
Balance, end of period 129,245,000  
Common Stock    
Reconciliation of the beginning and ending common stock outstanding    
Balance, beginning of period 125,279,455 125,131,593
Issuance of common stock 3,895,667 26,203
Nonvested share-based awards, net of withheld shares 70,221 121,659
Balance, end of period 129,245,343 125,279,455