Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2017
Issuance of Common Stock
Net proceeds from issuance of common shares		$ 705,012
Common stock
Issuance of Common Stock
Shares issued	11,850,000
Underwriting discounts and offering costs	$ 29,800
Net proceeds from issuance of common shares	$ 704,900