Goodwill and Other Intangible Assets - Goodwill reconciliation (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Balance at beginning of period	$ 68,742	$ 53,093
Acquisitions	0	17,382
Adjustments to fair value	0	1,844
Impairments	0	(3,577)
Balance at end of period	68,742	68,742
Energy segment:
Goodwill [Roll Forward]
Balance at beginning of period	66,571	52,939
Acquisitions	0	11,788
Adjustments to fair value	0	1,844
Impairments	0	0
Balance at end of period	66,571	66,571
Sports segment:
Goodwill [Roll Forward]
Balance at beginning of period	2,171	154
Acquisitions	0	5,594
Adjustments to fair value	0	0
Impairments	0	(3,577)
Balance at end of period	$ 2,171	$ 2,171