CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2014	$ 48,671	$ 1,025,941	$ 332,511	$ (41,618)	$ 1,365,505
Net income			16,903		16,903
Other comprehensive income/(loss)				(1,713)	(1,713)
TOTAL COMPREHENSIVE INCOME					15,190
Tax effect of stock-based compensation		(162)			(162)
Stock-based compensation expense		13,324			13,324
Issuance of common stock, net	399	322			721
Balance at Jun. 30, 2015	$ 49,070	$ 1,039,425	$ 349,414	$ (43,331)	$ 1,394,578