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Condensed Consolidated Financial Statements - Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Recent Accounting Pronouncements
Long-term deferred income taxes payable	$ 640,685			$ 640,685		$ 565,404
Diluted earnings per-share (in dollars per share)	$ 1.01		$ 0.79	$ 2.62	$ 2.08
Adjustment \| Accounting Standards Update 2015-17
Recent Accounting Pronouncements
Deferred tax assets, current						(129,300)
Long-term deferred income taxes payable						$ (129,300)
Scenario, adjustment \| Accounting Standards Update 2016-09
Recent Accounting Pronouncements
Income tax benefit		$ 3,000