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Equity-based compensation Plan (Equity-Based Compensation Plan) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Number of options - Beginning of period	845,619	917,269	951,523
Number of options - Options granted	0	0	0
Number of options - Options exercises	101,268	71,150	24,752
Number of options - Options forfeited	5,025	500	9,502
Number of options - End of period	739,326	845,619	917,269
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price - Beginning of period	$ 14.14	$ 14.08	$ 12.45
Weighted Average Exercise Price - Options granted	0	0	0
Weighted Average Exercise Price - Options exercises	13.41	12.96	12.43
Weighted Average Exercise Price - Options forfeited	17.05	15.26	16.65
Weighted Average Exercise Price - End of period	$ 14.28	$ 14.14	$ 14.08

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

Number of share options (or share units) exercised during the current period.

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