LONG-TERM DEBT: (Details) (USD $)	9 Months Ended			1 Months Ended			9 Months Ended		0 Months Ended			9 Months Ended				9 Months Ended		12 Months Ended					9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Jul. 31, 2011 Interest rate swap July 25, 2011 derivative agreement	Dec. 31, 2013 Interest rate swap July 25, 2011 derivative agreement	Jul. 25, 2011 Interest rate swap July 25, 2011 derivative agreement	Dec. 31, 2013 Interest rate swap July 25, 2011 derivative agreement Other, net	Jul. 25, 2011 Interest rate swap July 25, 2011 derivative agreement Cash flow hedge	Oct. 09, 2013 Term loan credit agreement	Dec. 31, 2013 Term loan credit agreement	Mar. 31, 2013 Term loan credit agreement	Dec. 31, 2013 Term loan credit agreement Quarterly installments payable through September 2014	Dec. 31, 2013 Term loan credit agreement Quarterly installments payable through September 2017	Dec. 31, 2013 Term loan credit agreement Quarterly installments payable through June 2018	Oct. 09, 2013 Term loan credit agreement Final payment due on October 9, 2018	Dec. 31, 2013 Term loan credit agreement LIBOR	Dec. 31, 2013 Capital leases and installment payment obligations	Mar. 31, 2013 Capital leases and installment payment obligations	Dec. 31, 2013 Other debt and long-term liabilities	Mar. 31, 2013 Other debt and long-term liabilities	Dec. 31, 2013 Revolving credit facility	Mar. 31, 2013 Revolving credit facility	Dec. 31, 2013 Revolving credit facility LIBOR	Dec. 31, 2013 Revolving credit facility Alternative base rate
Long-term debt
Total long-term debt and capital leases	$ 323,339,000		$ 253,505,000							$ 296,250,000	$ 218,000,000						$ 14,454,000	$ 21,368,000	$ 12,635,000	$ 14,137,000
Less current installments	25,636,000		16,105,000
Long-term debt, excluding current installments	297,703,000		237,400,000
Long-term debt stated interest rate percentage, minimum																	3.00%	3.00%
Long-term debt stated interest rate percentage, maximum																	8.00%	8.00%
Maximum remaining maturity period of debt																	9 years	9 years
Amount borrowed									300,000,000
Existing debt repaid with proceeds of term loan	230,167,000	19,790,000							215,000,000
Payment of fees related to the new credit agreement	4,370,000								4,400,000
Aggregate amount of borrowing commitment										300,000,000											300,000,000
Required quarterly installment payments												3,800,000	7,500,000	11,300,000
Final payment of long-term debt															161,300,000
Long-term debt variable interest rate description																LIBOR							LIBOR	Alternative base rate
Long-term debt basis spread on variable interest rate (as a percent)																2.00%							2.00%
Weighted-average interest rate on long-term debt (as a percent)										2.20%
Outstanding revolving credit borrowings																					0	0
Outstanding letters of credit																					2,200,000
Revolving credit facility dividend restrictions amount, maximum																					30,000,000
Fixed interest rate payable on swap (as a percent)						0.94%
Interest rate swap basis spread on variable interest rate (as a percent)								3.00%
Notional amount of derivative								150,000,000
Description of variable interest rate basis receivable on swap				LIBOR
LIBOR rate (as a percent)					0.24%
Fair market value of the derivative						0
Unrealized loss of the derivative recorded in other comprehensive income (loss)							$ 100,000