Derivative Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2015

Derivative Financial Instruments [Abstract]

Gains and Losses from Foreign Exchange Forward Contracts, Net of Gains and Losses on Underlying Transactions Denominated in Foreign Currency

	Year Ended March 31,			Three Months Ended March 31,			Years Ended December 31,
	2015			2014			2013			2012
	(Dollars In thousands)
Gain (loss) on foreign exchange forward contracts	$	4,850		$	454		$	(282	)	$	(2,232	)
Gain (loss) on underlying transactions denominated in foreign currency		(5,169	)		(521	)		(614	)		666
Net losses	$	(319	)	$	(67	)	$	(896	)	$	(1,566	)