XML 39 R25.htm IDEA: XBRL DOCUMENT

Revenue Concentration	12 Months Ended
Revenue Concentration	Dec. 31, 2017
Revenue Concentration [Abstract]
Revenue Concentration	(18)Revenue Concentration Revenue from the Company’s ten largest lessees represented 44.5%, 41.5% and 51.9% of total revenue for the years ended December 31, 2017, 2016 and 2015, respectively. Revenue from the Company’s single largest lessee accounted for 10.8%, or $37.5 million, 10.8%, or $31.7 million, and 11.6%, or $29.0 million, of total revenue for the years ended December 31, 2017, 2016 and 2015, respectively. Revenue from the Company’s second largest lessee accounted for 10.0%, or $34.7 million, 7.0%, or $20.6 million, and 8.4%, or $21.1 million, of total revenue for the years ended December 31, 2017, 2016 and 2015, respectively.