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Stockholders' Equity	12 Months Ended
Stockholders' Equity	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 This program superseded the previous $100.0 million repurchase authorization.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.