Stockholders' Equity - Reconciliation of beginning and ending common stock outstanding (Details) - shares		9 Months Ended	12 Months Ended
	Aug. 14, 2017	Sep. 30, 2017	Dec. 31, 2016
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period		116,417,000
Balance, end of period		124,890,000	116,417,000
Common Stock
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period		116,416,900	101,517,009
Issuance of common stock	8,337,500	8,386,035	14,063,100
Nonvested share-based awards, net of withheld shares		87,034	836,791
Balance, end of period		124,889,969	116,416,900