XML 26 R14.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Shareholders' Equity | 12 Months Ended
--- | ---
Dec. 31, 2017
Equity [Abstract] |
Shareholders' Equity | SHAREHOLDERS’ EQUITY The following table details activity in our common stock:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
Stock option exercises | 1,113 |  |  | $ | 49,845 |  |  | 827 |  |  | $ | 23,527 |  |  | 1,118 |  |  | $ | 23,160 |
Purchases of common stock | (44 | ) |  | (6,613 | ) |  | (882 | ) |  | (112,699 | ) |  | (5 | ) |  | (645 | )
Employee stock plan purchases | 51 |  |  | 7,044 |  |  | 47 |  |  | 6,236 |  |  | 43 |  |  | 4,671 |
Shares issued for acquisitions | — |  |  | — |  |  | — |  |  | — |  |  | 2,149 |  |  | 364,333 |
As of February 20, 2018, we had authorization from our board of directors to repurchase up to 2.0 million additional shares of our common stock.

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
Name: | us-gaap_StockholdersEquityNoteDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration