Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax assets (noncurrent)	$ 323,784	$ 269,237			$ 323,784			$ 269,237
Total assets	4,526,970	3,837,672			4,526,970			3,837,672
Additional paid-in-capital	3,118,969	2,450,782			3,118,969			2,450,782
Retained earnings	487,308	216,644			487,308			216,644
Total stockholders' equity	3,338,458	2,550,251			3,338,458			2,550,251
Total liabilities and stockholders' equity	4,526,970	3,837,672			4,526,970			3,837,672
Selling, general, and administrative	174,588	175,307	$ 144,003	$ 96,730	333,579	$ 199,957	$ 343,960	519,267
Total operating expenses	653,758	586,526	537,324	437,610	1,239,817	871,788	1,409,112	1,995,638
Income from operations	344,859	215,803	188,464	228,090	628,412	419,652	608,116	823,919
Income before income taxes	327,996	189,723	181,823	208,803	604,519	389,689	571,512	761,235
Income tax expense	133,353	99,628	98,448	112,452	333,855	225,033	323,481	423,109
Net Income (Loss) Attributable to Parent	$ 194,643	$ 90,095	$ 83,375	$ 96,351	$ 270,664	$ 164,656	$ 248,031	$ 338,126
Net income per share - basic	$ 1.89	$ 0.89	$ 0.83	$ 0.96	$ 2.64	$ 1.65	$ 2.47	$ 3.36
Net income per share - diluted	$ 1.69	$ 0.78	$ 0.73	$ 0.85	$ 2.35	$ 1.46	$ 2.19	$ 2.98
Non-cash compensation expense	$ 94,257			$ 64,828	$ 198,016	$ 140,613
Deferred taxes						(27,714)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities					$ (114,560)	225,283
Previously Reported
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax assets (noncurrent)		$ 266,869						$ 266,869
Total assets		3,871,827						3,871,827
Additional paid-in-capital		2,404,118						2,404,118
Retained earnings		255,382						255,382
Total stockholders' equity		2,542,325						2,542,325
Total liabilities and stockholders' equity		3,871,827						3,871,827
Selling, general, and administrative		143,743	$ 149,748	102,414		211,264	$ 361,012	504,755
Total operating expenses		554,962	543,069	443,294		883,095	1,426,164	1,981,126
Income from operations		247,367	182,719	222,406		408,345	591,064	838,431
Income before income taxes		221,287	176,078	203,119		378,382	554,460	775,747
Income tax expense		111,111	96,358	110,384		220,204	316,562	427,673
Net Income (Loss) Attributable to Parent		$ 110,176	$ 79,720	$ 92,735		$ 158,178	$ 237,898	$ 348,074
Net income per share - basic		$ 1.09	$ 0.79	$ 0.92		$ 1.58	$ 2.37	$ 3.46
Net income per share - diluted		$ 0.96	$ 0.70	$ 0.82		$ 1.40	$ 2.10	$ 3.07
Non-cash compensation expense						$ 151,920
Deferred taxes						(32,543)
Revision Adjustment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax assets (noncurrent)		$ 22,152						$ 22,152
Total assets		22,152						22,152
Additional paid-in-capital		60,890						60,890
Retained earnings		(38,738)						(38,738)
Total stockholders' equity		22,152						22,152
Total liabilities and stockholders' equity		22,152						22,152
Selling, general, and administrative		31,564	$ (5,745)	$ (5,684)		(11,307)	$ (17,052)	14,512
Total operating expenses		31,564	(5,745)	(5,684)		(11,307)	(17,052)	14,512
Income from operations		(31,564)	5,745	5,684		11,307	17,052	(14,512)
Income before income taxes		(31,564)	5,745	5,684		11,307	17,052	(14,512)
Income tax expense		(11,483)	2,090	2,068		4,829	6,919	(4,564)
Net Income (Loss) Attributable to Parent		$ (20,081)	$ 3,655	$ 3,616		$ 6,478	$ 10,133	$ (9,948)
Net income per share - basic		$ (0.20)	$ 0.04	$ 0.04		$ 0.07	$ 0.10	$ (0.10)
Net income per share - diluted		$ (0.18)	$ 0.03	$ 0.03		$ 0.06	$ 0.09	$ (0.09)
Non-cash compensation expense						$ (11,307)
Deferred taxes						$ 4,829
Revised
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax assets (noncurrent)		$ 289,021						$ 289,021
Total assets		3,893,979						3,893,979
Additional paid-in-capital		2,465,008						2,465,008
Retained earnings		216,644						216,644
Total stockholders' equity		2,564,477						2,564,477
Total liabilities and stockholders' equity		$ 3,893,979						$ 3,893,979