Condensed Consolidated Statements of Changes in Shareholders' Equity (Deficit) - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Accumulated Deficit
Beginning Balance at Dec. 31, 2016	$ 2,433,869	$ 2,077	$ 3,760,729	$ (1,328,937)
Beginning Balance (in shares) at Dec. 31, 2016	207,676,827	207,676,827
Increase (Decrease) in Shareholders' Equity
Issuance of common stock	$ 139,414	$ 38	139,376
Issuance of common stock (in shares)		3,864,872
Stock option activity	18,641	$ 9	18,632
Stock option activity (in shares)		899,846
Restricted stock activity	9,051	$ 2	9,049
Restricted stock activity (in shares)		161,762
Dividends paid	(395,210)	$ 0	0	(395,210)
Dividends paid (in shares)		0
Net income	287,339			287,339
Ending Balance at Sep. 30, 2017	$ 2,493,104	$ 2,126	$ 3,927,786	$ (1,436,808)
Ending Balance (in shares) at Sep. 30, 2017	212,603,307	212,603,307