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Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Retained Earnings	$ (1,113,143,000)		$ (1,063,610,000)
Increase in cash flow from operations	(49,521,000)	$ (49,843,000)
Accounting Standards Update 2018-02 | Adjustment
Retained Earnings	383,000
Accumulated other comprehensive loss	$ (383,000)
Accounting Standards Update 2016-18 | Adjustment
Increase in cash flow from operations		$ 1,000

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