Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Other Liabilities, Noncurrent [Abstract]
Liabilities related to uncertain tax positions	[1]	$ 101,677		$ 25,340
Executive deferred compensation plan obligation		21,631		22,168
Environmental liabilities		33,805	[2]	4,841	[2]	$ 9,213
Asset retirement obligations	[2]	37,230		15,085
Other		60,483		20,271
Total		$ 254,826		$ 87,705

[1] See Note 20, “Income Taxes.”

[2] See Note 17, “Commitments and Contingencies.”