Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - Common Stock - USD ($)	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Equity
Number of shares repurchased	44,543	30,839
Equity Distribution Agreements
Equity
Maximum offering capacity under shelf registration statement	$ 200,000,000
Shares common stock sold	0
Amount available under effective shelf registration statement	$ 200,000,000

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-Publisher FASB
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