Summary of Significant Accounting Policies (Schedule of prior period revisions) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Deferred income taxes	$ 0	$ 0
Total current assets	686,188	828,654
Deferred income taxes		0
Total assets	1,398,801	1,493,071
Deferred income taxes, net	7,321	28,479
Total current liabilities	228,790	240,903
Deferred income taxes, net	96,497	94,510
Total liabilities	1,455,628	1,471,019
Total stockholders' equity	(56,827)	22,052
Total liabilities and stockholders' equity	$ 1,398,801	1,493,071
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Deferred income taxes		29,192
Total current assets		857,846
Deferred income taxes		51,129
Total assets		1,573,392
Deferred income taxes, net		57,671
Total current liabilities		270,095
Deferred income taxes, net		145,639
Total liabilities		1,551,340
Total stockholders' equity		22,052
Total liabilities and stockholders' equity		1,573,392
Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Deferred income taxes		(29,192)
Total current assets		(29,192)
Deferred income taxes		(51,129)
Total assets		(80,321)
Deferred income taxes, net		(29,192)
Total current liabilities		(29,192)
Deferred income taxes, net		(51,129)
Total liabilities		(80,321)
Total stockholders' equity		0
Total liabilities and stockholders' equity		$ (80,321)