Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	[1]	Dec. 31, 2013	[1]
Quarterly Financial Data [Abstract]
Revenue	$ 66,149	$ 57,788	$ 72,802	$ 60,584	$ 61,742	$ 65,031	$ 69,922	$ 58,053	$ 257,323	$ 254,748		$ 258,221
Net income (loss)	3,258	328	16,006	3,102	17,186	3,939	4,773	(254)	22,694	25,644		9,145
Net income (loss) attributable to RDI common stockholders	$ 3,277	$ 381	$ 15,997	$ 3,118	$ 17,220	$ 3,939	$ 4,757	$ (215)	$ 22,773	$ 25,701		$ 9,041
Basic earnings (loss) per share	$ 0.14	$ 0.02	$ 0.69	$ 0.13	$ 0.74	$ 0.17	$ 0.20	$ (0.01)	$ 0.98	$ 1.10		$ 0.39
Diluted earnings (loss) per share	$ 0.14	$ 0.02	$ 0.68	$ 0.13	$ 0.72	$ 0.17	$ 0.20	$ (0.01)	$ 0.97	$ 1.08		$ 0.38

[1] Certain prior period amounts have been reclassified to conform to the current period presentation (see Note 2 - Significant Accounting Policies - Reclassifications).