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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |
Treasury Stock [Text Block] | Stockholders' Equity On January 16, 2015, the Company's Board of Directors approved a $100.0 million share repurchase program. During 2015, the Company repurchased 43,000 shares of its common stock at a cost of $1.6 million. All shares repurchased under this program were retired, which resulted in a reduction of $0.4 million in paid-in capital and a reduction of $1.2 million in retained earnings. The Company's stock-based compensation plans accept shares of the Company's common stock as payment for the exercise price of stock options. During 2015 the Company received 46,174 shares, with a $2.2 million value, as payment for the exercise of stock options. Those shares were retired upon receipt, which resulted in a reduction of $0.8 million in paid-in capital and a reduction of $1.4 million in retained earnings. On June 5, 2015, the Company issued 0.8 million shares of its common stock valued at $30.2 million, in connection with the acquisition of Creative Circle. On June 10, 2016, the Board of Directors approved a $150.0 million, two-year stock repurchase program. This program superseded the previous $100.0 million repurchase authorization. During 2016, the Company repurchased 1.1 million shares of its common stock at a cost of $43.1 million. All shares repurchased under this program were retired, which resulted in a reduction of $11.9 million in paid-in capital and a reduction of $31.2 million in retained earnings. During 2017, the Company repurchased 1.2 million shares of its common stock at a cost of $58.1 million under the existing stock repurchase program. All shares repurchased under this program were retired, which resulted in a reduction of $13.2 million in paid-in capital and a reduction of $44.8 million in retained earnings. The remaining authorized amount under the repurchase program at December 31, 2017 is $48.8 million. The balances of accumulated other comprehensive income (loss) at December 31, 2017, 2016 and 2015 and the activity within those years was primarily comprised of foreign currency translation adjustments.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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