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Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	19. Supplemental Cash Flow Information Cash paid for interest totaled $7.0 million, $11.6 million and $18.4 million for the years ended December 31, 2015, 2016 and 2017, respectively. Cash paid for income taxes totaled $49.8 million, $40.9 million and $78.1 million for the years ended December 31, 2015, 2016 and 2017, respectively.

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- Definition

The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-URI http://asc.fasb.org/topic&trid=2134446

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- References

No definition available.

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