CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2016	$ 2,248,724	$ 1,915	$ 1,042,696	$ 2,116,341	$ (1,134)	$ (911,094)
Beginning Balance (in shares) at Dec. 31, 2016	191,525,872	191,526,000
Net loss	$ (155,723)			(155,723)
Foreign currency translation adjustment	2,988				2,988
Equity offering	471,570	$ 182	471,388
Equity offering (in shares)		18,170,000
Shares issued for acquisition	1,039,396	$ 463	1,038,933
Shares issued for acquisition (in shares)		46,298,000
Exercise of stock options	$ 223		223
Exercise of stock options (in shares)	10,000	10,000
Issuance of restricted stock		$ 9	(9)
Issuance of restricted stock (in shares)		891,000
Vesting of restricted stock units (in shares)		34,000
Forfeitures of restricted stock (in shares)		(15,000)
Stock-based compensation	$ 22,170		22,170
Payment of cash dividends	(7,595)			(7,595)
Purchase of treasury stock	(3,950)					(3,950)
Ending Balance at Jun. 30, 2017	$ 3,617,803	$ 2,569	$ 2,575,401	$ 1,953,023	$ 1,854	$ (915,044)
Ending Balance (in shares) at Jun. 30, 2017	256,914,385	256,914,000