Goodwill And Other Intangible Assets (Other Intangibles) (Details) (USD $)	3 Months Ended		9 Months Ended									9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Dec. 31, 2013 Customer Relationships [Member]	Mar. 31, 2013 Customer Relationships [Member]	Dec. 31, 2013 Non-competition agreements [Member]	Mar. 31, 2013 Non-competition agreements [Member]	Dec. 31, 2013 Other intangible assets [Member]	Mar. 31, 2013 Other intangible assets [Member]	Dec. 31, 2013 Customer relationships, non-competition agreements and other [Member]	Dec. 31, 2012 Customer relationships, non-competition agreements and other [Member]	Dec. 31, 2013 Weighted Average [Member] Customer Relationships [Member]	Mar. 31, 2013 Weighted Average [Member] Customer Relationships [Member]	Dec. 31, 2013 Weighted Average [Member] Non-competition agreements [Member]	Mar. 31, 2013 Weighted Average [Member] Non-competition agreements [Member]	Dec. 31, 2013 Minimum [Member] Customer Relationships [Member]	Dec. 31, 2013 Maximum [Member] Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life														17 years	15 years	7 years	7 years	7 years	25 years
Gross Carrying Amount	$ 383,174,000		$ 383,174,000		$ 338,784,000	$ 343,141,000	$ 294,598,000	$ 39,834,000	$ 42,891,000	$ 199,000	$ 1,295,000
Accumulated Amortization	(120,688,000)		(120,688,000)		(111,960,000)	(101,968,000)	(91,354,000)	(18,710,000)	(19,338,000)	(10,000)	(1,268,000)
Finite-Lived Intangible Assets, Net	262,486,000		262,486,000		226,824,000	241,173,000	203,244,000	21,124,000	23,553,000	189,000	27,000
Intangible asset residual value	0		0
Amortization	7,665,000	6,614,000	22,141,000	19,950,000								21,200,000	19,200,000
Estimated future amortization expense in remainder of 2014	7,300,000		7,300,000
Estimated future amortization expense in 2015	28,800,000		28,800,000
Estimated future amortization expense in 2016	27,100,000		27,100,000
Estimated future amortization expense in 2017	25,300,000		25,300,000
Estimated future amortization expense in 2018	23,600,000		23,600,000
Estimated future amortization expense thereafter	$ 150,400,000		$ 150,400,000