Subsequent Events (Narrative) (Details) $ in Millions		1 Months Ended		12 Months Ended
		Nov. 30, 2017 USD ($) installment shares	Jul. 31, 2005	Sep. 30, 2017 installment shares
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				1,946,000
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Value, Restricted Stock Award, Gross | $		$ 65.5
Performance-based Award [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	[1]			325,000
Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Number of Equal Annual Installments | installment		3
Target multiplier (up to)		1
Time-based Award [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	[1]			1,263,000
Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Value, Restricted Stock Award, Gross | $		$ 37.4
Maximum [Member] | Performance-based Award [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				325,000
Maximum [Member] | Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		189,000
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Target multiplier (up to)				1
Executive Officer [Member] | Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Value, Restricted Stock Award, Gross | $		$ 28.1
Executive Officer [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Target multiplier (up to)		1
Executive Officer [Member] | Maximum [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		250,000
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Target multiplier (up to)				2
Chief Executive Officer [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Target multiplier (up to)		2
Share-based Compensation Award, Tranche One [Member] | Time-based Award [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				108,000
Share-based Compensation Award, Tranche Two [Member] | Time-based Award [Member] | Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Number of Equal Annual Installments | installment				2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				217,000
Line of Credit [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from (Repayments of) Lines of Credit | $		$ 50.0

[1] The performance-based RSUs were issued to employees, our executive officers, our directors and a consultant. Executive officers may earn up to one or, for our CEO, two times the number of time-based RSUs (up to a maximum of 325 thousand shares) if certain performance conditions are met. Of the service-based RSUs, approximately 108 thousand shares will vest in one installment on or about the anniversary of the date of grant. Approximately 217 thousand shares will vest in two substantially equal annual installments on or about the anniversary of the date of grant. All other service-based RSUs will vest in three substantially equal annual installments on or about the anniversary of the date of grant. The performance-based RSUs will vest in three substantially equal installments on the later of November 15, 2017, November 15, 2018 and November 15, 2019, or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved.