Segment Reporting - Narrative (Details)	6 Months Ended	12 Months Ended	6 Months Ended			6 Months Ended			6 Months Ended
	Jun. 30, 2014 segment	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] security	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Real Estate Investment Segment [Member] note_receivable	Jun. 30, 2014 Real Estate Investment Segment [Member] Commercial Mortgage Backed Securities [Member] security	Jun. 30, 2014 Real Estate Investment Segment [Member] Consolidated Properties [Member] property sqft state	Jun. 30, 2014 Real Estate Investment Segment [Member] Unconsolidated Properties [Member] sqft property	Jun. 30, 2014 Real Estate Investment Segment [Member] Minimum [Member]	Jun. 30, 2014 Real Estate Investment Segment [Member] Maximum [Member]
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Real estate portfolio, property concentration, percentage					70.00%
Real estate investments, property concentration, medium-term leases, percentage					30.00%
Real estate portfolio, property average remaining lease term									10 years	12 years
Minimum Lease Term of Contract Considered Long-term	10 years
Lease Term of Contract, Remaining Term Considered Medium-term			3 years	8 years
Number of owned properties							3,966	6
Square feet of property							106,800,000
Number of states in which entity operates							49
Percentage of rentable space leased							98.80%
Real estate property, weighted average remaining lease term							9 years 11 months 12 days
Number of securities acquired		10				25
Number of loans held for investment					14
Net rentable area								1,600,000