Share Capital (Tables)

6 Months Ended

Jun. 30, 2015

Stockholders' Equity Note [Abstract]

Summary of shares issued and outstanding

The following table is a summary of ordinary shares issued and outstanding:

(in thousands)	June 30, 2015		December 31, 2014
Balance – beginning of period	255,183		278,253
Exercise of options	220		424
Net issuance of restricted shares	1,536		1,246
Share buybacks (1)	(2,982	)	(24,740	)
Issue of shares	49,935		—
Balance – end of period	303,892		255,183

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(1) Includes share buybacks associated with authorized share buyback programs as well as purchases related to satisfying tax withholding obligations of employees in connection with the vesting of restricted shares granted under the Company's equity compensation programs.

Schedule of Valuation Assumptions - Stock Options

The fair value of the options issued was estimated on the date of grant using the Black-Scholes option pricing model using the following weighted average assumptions:

Dividend yield	2.00	%
Risk free interest rate	1.70	%
Volatility	21.6	%
Expected lives	6.0 years