Stockholders' Equity - Reconciliation of beginning and ending common stock outstanding (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period	134,706,000
Balance, end of period	134,932,000	134,706,000
Common Stock
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period	134,706,154	125,279,455
Issuance of common stock	210,271	9,251,440
Nonvested share-based awards, net of withheld shares	15,781	175,259
Balance, end of period	134,932,206	134,706,154