Goodwill and Intangibles (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	$ 36,554	$ 36,754	$ 36,790
Accumulated Amortization	8,108	7,065	6,661
Tradenames and trademarks [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	12,793	12,793	12,793
Accumulated Amortization	0	0	0
Customer relationships [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	22,057	22,057	22,057
Accumulated Amortization	7,484	6,358	5,984
Non-compete [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	0	200	200
Accumulated Amortization	0	200	200
Trademarks [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	403	403	403
Accumulated Amortization	235	213	205
Patents [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	1,301	1,301	1,337
Accumulated Amortization	$ 389	$ 294	$ 272