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Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Upon its scheduled maturity in April 2018, we repaid the $250 million principal amount of our 4.625% convertible notes and all related accrued interest in full. In May 2018, we entered into an agreement to acquire a 20% minority interest in 5 Arches, LLC for $10 million, with a one-year option to purchase all remaining equity in the company for $40 million. In connection with this investment, we also entered into a loan purchase agreement with 5 Arches, LLC establishing a flow relationship to purchase business-purpose real estate loans originated by the company.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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