Summary of Significant Accounting Policies - Acquisition Related Expenses and Other One-Time Transaction Related Expenses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Merger related costs:
Strategic advisory services		$ 0	$ 0	$ 0	$ 32,615
Transfer taxes		0	0	0	5,109
Legal fees and expenses		0	1,563	0	4,547
Personnel costs and other reimbursements		0	0	0	751
Multi-tenant spin off		0	2,859	0	5,180
Other fees and expenses		0	346	0	1,676
Other non-routine transaction related costs:
Post-transaction support services		0	0	0	14,251
Subordinated distribution fee		0	0	0	78,244
Audit Committee Investigation and related matters	[1]	14,386	0	29,702	0
Furniture, fixtures and equipment		0	0	0	14,085
Legal fees and expenses	[2]	2,478	0	2,953	1,826
Personnel costs and other reimbursements		0	275	0	2,718
Other fees and expenses		0	2,379	632	6,718
Total	[3]	$ 16,864	$ 7,422	$ 33,287	$ 167,720

[1] Includes all fees and costs associated with the Audit Committee Investigation and various litigations and investigations prompted by the results of the Audit Committee Investigation, including fees and costs reimbursed pursuant to the Company’s indemnification obligations.

[2] Primarily relates to fees incurred in connection with a legal matter resolved in early 2014.

[3] Includes $40,000 and $137.8 million of expenses incurred for the three and six months ended June 30, 2014, respectively, paid to affiliates. No such expenses were incurred during the three and six months ended June 30, 2015.