Goodwill and Other Intangible Assets - Goodwill reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Goodwill [Roll Forward]
Balance, beginning of period	$ 30,864	$ 67,530
Impairments	0	(36,666)
Balance, end of period	30,864	30,864
Energy segment:
Goodwill [Roll Forward]
Balance, beginning of period	28,693	65,359
Impairments	0	(36,666)
Balance, end of period	28,693	28,693
Sports segment:
Goodwill [Roll Forward]
Balance, beginning of period	2,171	2,171
Impairments	0	0
Balance, end of period	$ 2,171	$ 2,171