Shareholder's Equity (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Stock Issued During Period, Shares, New Issues	6.6
Proceeds from Issuance of Common Stock	$ 222,672	$ 30,591
Common Stock Value Authorized Under Stock Offering Program	400,000
At-the-market equity issuance [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	215,600
Gross Proceeds [Member] | At-the-market equity issuance [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ 218,100