Related Party Transactions and Arrangements (ANST Office Build-out) (Details) - Affiliated Entity [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Related Party Transaction [Line Items]
Related party expenses	$ 26,529	$ 37,222	$ 54,023	$ 91,479
ANST Office Build-Out [Member]
Related Party Transaction [Line Items]
Related party expenses	$ 0	$ 335	$ 0	$ 335