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Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance achievement rate	120.00%
Vesting period, years (maximum)	3 years
Share-based compensation expense	$ 28,288,000	$ 23,761,000	$ 44,300,000
Excess tax benefit realized for the tax deductions of share-based arrangements	782,000	3,328,000	1,596,000
Supervisory Board Members
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 3,200,000	$ 7,000,000	$ 6,380,000
Number of shares exercisable, ending balance (in shares)	1,439,000	1,700,000	2,100,000
Weighted average exercise price exercisable, ending balance (dollars per share)	$ 19.84	$ 19.27	$ 18.10
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense related to employee stock option awards	$ 76,500,000
Unrecognized share-based compensation expense recognized weighted average period, years	2 years 5 months 12 days
Pre-vesting forfeitures percentage	6.50%
Weighted-average grant date fair value of restricted stock units granted (dollars per share)	$ 23.81	$ 24.91	$ 22.73
Total fair value of restricted stock units	$ 27,400,000	$ 28,700,000	$ 34,100,000
Certain Grants, Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years (maximum)	10 years
The 2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved and available for issuance under the plan (in shares)	0
The 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved and available for issuance under the plan (in shares)	17,900,000
Vesting period, years (maximum)	10 years
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years (maximum)	3 years
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years (maximum)	5 years
Forfeitures of Share-Base Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ (2,000,000)

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Possible Performance Achievement Rate

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Pre Vesting Forfeitures Percentage

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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