Related Party Arrangements - NorthStar Realty Purchase Common Stock (Narrative) (Details) - USD ($) |
1 Months Ended | 6 Months Ended | 12 Months Ended | |
---|---|---|---|---|
Jan. 31, 2015 |
Feb. 28, 2013 |
Jun. 30, 2016 |
Dec. 31, 2015 |
|
Related Party Transaction [Line Items] | ||||
Value of common stock issued | $ 296,000 | $ 697,491,000 | ||
NorthStar Realty | Distribution Support Agreement | Sponsor | ||||
Related Party Transaction [Line Items] | ||||
Common stock purchase price per share (in dollars per shares) | $ 9.00 | |||
Common stock follow-on offering price per share (in dollars per share) | $ 9.18 | |||
Number of shares issued (shares) | 222,223 | |||
Value of common stock issued | $ 2,000,000 | |||
Requirement to purchase common stock (shares) | 588,116 | |||
Requirement to purchase common stock | $ 5,300,000 | |||
NorthStar Realty | Distribution Support Agreement | Maximum | Sponsor | ||||
Related Party Transaction [Line Items] | ||||
Value committed to purchase | $ 10,000,000 |