Capital Stock (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Capital Stock

The following is a schedule of changes in the number of common shares outstanding since the beginning of 2015:

	Six Months Ended June 30, 2016		Year Ended December 31, 2015
Beginning balance		169,316,460		168,628,177
SARs exercised		—		77,002
Restricted stock grants		459,099		335,103
Restricted stock units vested		246,564		252,507
Treasury shares issued		13,772		23,671
Ending balance		170,035,895		169,316,460