CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 8,590	$ 16,716	$ 14,933	$ 29,079
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(57)	17	(22)	11
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(93)	92	(37)	239
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	14	16	28	30
Other Comprehensive Income (Loss), Net of Tax	(136)	125	(31)	280
Total comprehensive income	$ 8,454	$ 16,841	$ 14,902	$ 29,359