Significant Accounting Policies Significant Accounting Policies (Recently Adopted Pronouncements) (Details Textuals 5) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Retained Earnings (Accumulated Deficit)	$ (2,018,989)		$ (1,058,954)
Deferred tax liabilities, net	293,878		852,089
Other current assets	(10,684)		(10,005)
Paid-in capital in excess of par	$ 2,534,670		2,353,549
ASU 2016-09 Cumulative Effect Adjustment for Timing of Recognition of Excess Tax Benefits
New Accounting Pronouncement, Early Adoption [Line Items]
Retained Earnings (Accumulated Deficit)		$ 15,700
Deferred tax liabilities, net		(14,800)
Other current assets		(800)
ASU 2016-09 Cumulative Effect of Actual Forfeiture Rate
New Accounting Pronouncement, Early Adoption [Line Items]
Retained Earnings (Accumulated Deficit)		400
Paid-in capital in excess of par		$ (400)
ASU 2015-17 Simplifying the Presentation of Deferred Income Taxes | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred tax assets, net			(1,500)
Deferred tax liabilities, net			1,500
Other assets | ASU 2015-03 and ASU 2015-15 Simplifying the Presentation of Debt Issuance Costs
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification of debt issuance costs			32,800
Long-term debt, net of current portion | ASU 2015-03 and ASU 2015-15 Simplifying the Presentation of Debt Issuance Costs
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification of debt issuance costs			$ (32,800)