Goodwill (Details) (USD $) In Thousands, unless otherwise specified				6 Months Ended		0 Months Ended	6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2014 Mobile Development Company	Mar. 10, 2014 Mobile Development Company	Mar. 26, 2014 TBL	Jun. 30, 2014 TBL
Goodwill [Roll Forward]
Balance at December 31, 2013	$ 42,436	$ 42,436	$ 38,500		$ 500
Acquisition during period				500			3,436
Balance at June 30, 2014	42,436	42,436	38,500		500	3,436
Total purchase price						$ 5,300