Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Contractual Obligations and Commitments
Additional Operating Leases 2013	$ 3,171
Additional Operating Leases 2014	2,442
Additional Operating Leases 2015	1,857
Additional Operating Leases 2016	1,834
Additional Operating Leases 2017	1,152
Additional operating leases thereafter	7,888
Additional operating leases total	18,344
Additional other contractual obligations 2013	1,014
Additional other contractual obligations 2014	544
Additional other contractual obligations 2015	279
Additional other contractual obligations 2016	108
Additional other contractual obligations 2017	163
Additional other contractual obligations thereafter	996
Additional other contractual obligation total	3,104
Additional contractual obligations 2013	4,185
Additional contractual obligations 2014	2,986
Additional contractual obligations 2015	2,136
Additional contractual obligations 2016	1,942
Additional contractual obligations 2017	1,315
Additional contractual obligations thereafter	8,884
Additional contractual obligations	$ 21,448