Goodwill and Other Intangible Assets - Goodwill reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Roll Forward]
Balance at beginning of period	$ 68,139	$ 53,093
Acquisitions	0	16,779
Adjustments to fair value	0	1,844
Impairments	0	(3,577)
Balance at end of period	68,139
Energy segment:
Goodwill [Roll Forward]
Balance at beginning of period	65,968	52,939
Acquisitions	0	11,185
Adjustments to fair value	0	1,844
Impairments	0	0
Balance at end of period	65,968
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
Balance at end of period	$ 2,171