Income Taxes (Effective Income Tax Expense (Benefit) Rate) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax [Line Items]
Federal statutory tax expense (benefit) rate	35.00%	35.00%	35.00%
State tax expense (benefit), net of federal benefit	5.10%	1.90%	(69.80%)
Depletion in excess of basis	0.00%	(0.30%)	(14.70%)
Valuation allowances	(46.30%)	(35.80%)	89.80%
Effective Income Tax Rate Reconciliation Change in Deferred Tax Assets, Valuation Allowance Due to Foreign Taxes	(49.40%)	0.00%	(19.80%)
Foreign taxes	3.10%	1.20%	(10.80%)
Intraperiod allocation	0.00%	0.00%	4.50%
Change in unrecognized tax benefits	1.20%	(0.40%)	(30.10%)
Effective Income Tax Rate Reconciliation Nondeductible Expense Disallowed Compensation	3.10%	0.10%	11.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.60%	0.10%	8.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	0.50%	0.10%	3.30%
Permanent differences and other items	(0.70%)	0.40%	4.80%
Effective income tax expense (benefit) rate	(47.80%)	2.30%	12.50%