Consolidated Statement Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jun. 30, 2012	$ 964,602	$ 462	$ 616,197	$ 375,111	$ (21,785)	$ (5,383)
Balance, shares at Jun. 30, 2012	46,155,912	46,155,912			1,202,804
Net income	48,008			48,008
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	17,641					17,641
Issuance of common stock pursuant to compensation plans	11,999	6	11,993
Issuance of common stock pursuant to compensation plans, shares		626,125
Stock Issued During Period, Value, Acquisitions	57,586	10	57,576
Stock Issued During Period, Shares, Acquisitions		1,010,693
Stock based compensation income tax effects	7,437		7,437
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans	(8,409)				8,409
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans, shares					132,722
Stock based compensation charge	6,601		6,601
Balance at Dec. 31, 2012	$ 1,105,465	$ 478	$ 699,804	$ 423,119	$ (30,194)	$ 12,258
Balance, shares at Dec. 31, 2012	47,792,730	47,792,730			1,335,526