Consolidated Statements of Deficit (Unaudited) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (601,884)
WMLP distributions	(262)
Common stock issued as compensation	2,578
Net income (loss)	30,086
Other comprehensive income (loss)	19,401
Ending balance	(550,081)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 182
Beginning balance, shares | shares	18,162,148
Common stock issued as compensation	$ 2
Common stock options exercised, shares | shares	240,813
Ending balance	$ 184
Ending balance, shares | shares	18,402,961
Other Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 240,721
Common stock issued as compensation	2,576
Ending balance	243,297
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(171,300)
Other comprehensive income (loss)	19,403
Ending balance	(151,897)
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(672,219)
Net income (loss)	30,584
Ending balance	(641,635)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	732
WMLP distributions	(262)
Common stock issued as compensation	0
Net income (loss)	(498)
Other comprehensive income (loss)	(2)
Ending balance	$ (30)