Common Stock and Other Equity Related Transactions - ATM Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Class of Stock
Commissions paid to sales agents	$ 932	$ 335
ATM
Class of Stock
Total gross proceeds	$ 59,319
ATM \| Common Stock
Class of Stock
Shares of Common Stock sold (shares)	505,236
Weighted average price (usd per share)	$ 117.41
Commissions paid to sales agents	$ 771

Shares Issued, Weighted Average Price, Per Share

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